a liquid dispenser adapted for the dispensing of various liquids , such as water , is illustrated and designated generally as 30 in fig1 . liquid dispenser 30 is typically portable and , in the specific embodiment disclosed here , is operable in connection with an inverted water bottle or liquid container 35 . an external housing , designated generally as 40 , provides support for liquid container 35 and also encloses the liquid dispenser internal components . referring to fig1 external housing 40 includes a housing cover or top 49 , a top front wall portion 42 , a lower front wall portion 44 , side walls 47 and 48 , and alcove housing 60 . the extending edges of top and lower front wall portions 42 and 44 and sidewalls 47 and 48 form a space into which alcove housing 60 can be inserted . alcove housing 60 includes alcove wall 60a and alcove sidewalls 60b and 60c , and a drain receptacle 45 rests on a bottom wall of alcove housing 60 , not shown . while liquid dispenser 30 could be utilized without any cooling or heating apparatus , commercial units typically include at least a cooling unit or both heating and cooling units . when two faucets are used , one dispensing cold water and another dispensing room temperature water , this is known as a &# 34 ; cook and cold &# 34 ; unit ; if one faucet dispenses cold water and the other dispenses hot water , this is known as a &# 34 ; hot and cold &# 34 ; unit . turning now to fig2 a cooling or refrigeration apparatus , designated generally as 32 , includes conventional components such as compressor 34 , a condenser , a capillary tube , and a cooling pan 64 together with associated evaporator coils . a thermostat , relay and electrical coils are preferably located within a lower portion of housing 40 . still referring to fig2 a reservoir 80 is adapted for receiving liquid from liquid container 35 . reservoir 80 includes a lower tapered or conical portion 82 which mates within the truncated conical evaporator cooling plate or pan 64 . a baffle 100 fits within reservoir 80 , and the baffle and reservoir together are termed here the &# 34 ; reservoir assembly .&# 34 ; a cylindrical insulation shell 85 preferably covers the outside of reservoir 80 to limit ambient temperature effects on the reservoir liquid . insulation shell 85 is preferably made of a sufficiently rigid material suitable for facilitating the positioning of reservoir 80 , while having sufficient insulating properties , such as can be found with polystyrene materials like styrofoam . evaporator cooling plate or pan 64 can be located in the bottom portion of the cavity formed by the walls of insulation shell 85 , and is formed of a thermally conductive material . refrigerant - filled coils or tubes , such as copper tubes , are positioned in communication with cooling pan 64 , preferably secured or coiled around lower or side surfaces of cooling pan 64 . the bottom surface of reservoir 80 generally corresponds in shape , and rests directly in contact with , the inner surfaces of cooling pan 64 , maximizing the surface contact area and heat transfer between those surfaces , as discussed further below . cooling pan 64 is adapted to be maintained at low temperatures , such as temperatures in the range of 0 to 5 degrees fahrenheit , under control of a thermostat , thereby serving to chill the water in the lower region of the reservoir . to accommodate a liquid containment device , such as a bottle or other liquid container 35 , housing cover 49 includes opening 52 . when reservoir 80 is properly positioned , and housing cover 49 is in place , housing cover opening 52 is aligned or registers with the neck of liquid container 35 . this permits liquid in liquid container 35 to flow into and fill reservoir 80 . to facilitate the positioning of inverted bottle 35 , housing cover 49 can be provided with an inwardly - tapered and radiused collar portion surrounding cover opening 52 , and corresponding in shape to the neck of liquid container 35 . of course , many variations of the standard water cooler components well known to those of skill in the art can be utilized in the practice of the present invention . for example , such components as illustrated in u . s . pat . no . 4 , 629 , 096 , incorporated herein by reference , may be used . other structural components of liquid dispenser 30 of the present invention are necessary in its operation , and will now be described in conjunction with a description of that operation . referring to the &# 34 ; cook and cold &# 34 ; liquid dispenser embodiment shown in fig3 - 6 , liquid conduits 90a and 90b are provided in fluid communication with reservoir 80 . liquid conduits 90a and 90b are preferably integrally constructed with reservoir 80 , and terminate in spigots or faucets 51 and 52 ( as shown at fig1 - 2 ), which can be threadably fastened to the free ends of conduits 90a and 90b . to permit the coolest water to be drawn from reservoir 80 ( which is , of course , the water located closest to cooling pan 64 ), a cold water pickup tube 93 is provided with an open end 95 adjacent the bottom surface of reservoir 80 . pickup tube 93 is in fluid communication at its other end with liquid conduit 90b ( which leads to &# 34 ; cold &# 34 ; faucet 52 ). in the preferred embodiment , cold water pickup tube 93 is integrally formed with baffle 100 ( described below ), and is located directly below cold faucet 52 , minimizing cold water travel . cold water pickup tube 93 is also preferably slightly spaced from the outside surface of reservoir 80 a sufficient distance to prevent the build - up of ice due to the proximity of the cooling coils located on the outside surfaces of cooling pan 64 . as shown in fig2 , opening 95 of cold water pickup tube 93 includes a notched portion 95a . notched portion 95a ensures continued liquid flow should opening 95 be forced against bottom surface 81 of the reservoir . notched portion 95a also serves to help prevent blockage due to ice build - up at opening 95 . with the &# 34 ; cook and cold &# 34 ; embodiment , liquid conduit 90a can be placed in direct fluid communication with the liquid in reservoir 80 above baffle 100 . therefore , when faucet 51 is opened , nearly room temperature liquid will be supplied to &# 34 ; cook &# 34 ; faucet 51 . in this embodiment , if hot water conduit 160 leading to water heater 130 ( discussed below ) is present , it can be closed , rendering it nonfunctional . in either the &# 34 ; cook and cold &# 34 ; or &# 34 ; hot and cold &# 34 ; embodiments , to prevent the warmer water in the upper region of reservoir 80 from mixing with the cooler water located in the lower region of reservoir 80 , a substantially horizontal plate or baffle 100 is preferably located at about the same level as liquid conduits 90a and 90b . baffle 100 extends in a generally horizontal plane and acts as a temperature buffer to substantially prevent the incoming flow of water in the upper portion of reservoir 80 , originating from inverted liquid container 35 , from disturbing the temperature gradient existing across baffle 100 , and substantially raising the temperature of the cool water below baffle 100 . referring now to fig3 - 10 and 21 - 22 , baffle 100 preferably has smooth surfaces to induce laminar flow , and is provided with a cup - shaped region 101 and a curved lower periphery 102 . three equidistant narrow slots 104 are provided , as shown in fig2 . these equidistant slots permit an equal flow of water through the baffle from all sides , while limiting water flow and heat transfer effects between the water levels below and above the baffle . baffle 100 includes an aperture 110 at its center . referring specifically to fig2 and 22 , the top of cold water pickup tube 93 on baffle 100 terminates in an opening 97 , which is in fluid communication with a corresponding opening on the interior sidewall of reservoir 80 , and in continued fluid communication with liquid conduit 90b . opening 97 is surrounded by a flange 98 which nests within a corresponding bracelet 99 shown at fig7 and 8 ; this mating interaction serves to properly locate and hold baffle 100 within reservoir 80 . referring to fig3 - 10 , and more particularly to the &# 34 ; hot and cold &# 34 ; embodiment shown at fig7 - 10 , reservoir 80 includes a centrally - located , raised reservoir bottom 84 that can be integrally constructed with reservoir 80 . a central location for raised reservoir bottom 84 is preferred , since this placement maximizes the external surface area of the lower portion of reservoir 80 , thereby maximizing exposure to the cooling coils and increasing cooling efficiency . alternatively , as shown in fig2 , a side placement of raised reservoir bottom 84 could be employed , with hot water conduit 160 extending upwardly along a side of reservoir 80 . raised reservoir bottom terminates at its top in an open , room temperature water discharge port 86 . discharge port 86 is located at least slightly above &# 34 ; hot &# 34 ; faucet 51 ( not shown in fig7 - 10 ) and opens on the top surface of baffle 100 . referring to now fig2 port 133 of water heater or hot tank 130 is in fluid communication with upwardly extending hot water conduit 160 . hot water hose 188 is in fluid communication with hot water faucet 51 . as shown in fig1 , raised reservoir bottom 84 of reservoir 80 surrounds the periphery of hot water conduit 160 . raised reservoir bottom 84 preferably has a diameter substantially larger than hot water conduit 160 . hot water conduit 160 preferably includes raised vertical ribs 161 , which serve to facilitate the proper location of reservoir 80 . ribs 161 also function to space hot water conduit 160 and reservoir 80 . this spacing minimizes the heat transfer effects of the water cooled by cooling pan 64 on the water from liquid container 35 flowing down through hot water conduit 160 and into hot tank 130 . the raised central region 101 accommodates the raised reservoir bottom 84 and hot water conduit 160 which extend vertically above the horizontal plane of conduits 90a and 90b . hot water conduit 160 includes structure , such as elastomeric o - rings or washers 163 , so that when hot water conduit 160 is brought in a relatively tight , frictional engagement with raised reservoir bottom 84 , that engagement will be leak - free , preventing any liquid within reservoir 80 from flowing between the outside surface of hot water conduit 160 and the inside surface of raised reservoir bottom 84 . the upper end of hot water conduit 160 preferably terminates with structure , such as a fastener or nut 170 , permitting , through finger - tight engagement , the exertion of a downward compressive force on reservoir 80 , partially translating also into an outwardly directed radial force on the lower sides 88 of reservoir 80 , and ensuring that reservoir 80 will be maintained . in contact with cooling pan 64 . the cup - shaped portion 101 of baffle 100 is also designed to provide baffle 100 with sufficient central strength to withstand deformation when nut 170 is tightened down . referring to fig1 , hot water conduit 160 also preferably includes a ball check valve , such as floating polypropylene ball 157 , which can be moved against a seat 158 . the check valve of hot water conduit 160 acts to substantially prevent the recirculation of hot water from water heater 130 through hot water conduit 160 , port 86 , back into the upper region of reservoir 80 above baffle 100 . this further minimizes unwanted heat transfer effects between the upper and lower regions within the reservoir assembly . the proper engagement of the lower surface of reservoir 80 with cooling pan 64 will now be discussed . to facilitate disassembly , reservoir 80 must be readily removable from cooling pan 64 . reservoir 80 and tapering conical surfaces 88 should also be sized to fit in close , frictional engagement with the inner side surfaces of cooling pan 64 , to maximize cooling efficiency , though not so tightly as to prevent ready disassembly . this can be accomplished by designing the lower region of reservoir 80 with a frusto - conically tapering shape 88 , as shown in fig4 . as an alternative example , the lower reservoir edges 88 could be tapered with the lower reservoir portion having a rectangular configuration . referring again to the preferred embodiment shown within fig1 and 2 , the interconnection between reservoir 80 , alcove housing 60 , external housing 40 and the liquid dispensing means ( including liquid conduits 90a and 90b , and faucets 51 and 52 ) will now be described . with the external housing 40 assembled , an escutcheon plate or alcove adaptor 200 can be assembled to reservoir 80 , and serves to locate and secure the reservoir assembly within the external housing by engaging the periphery of a cut - out or opening formed below top front wall 42 . in addition to facilitating the use of the present invention with dispensers of different manufacturers , as discussed below , alcove adaptor 200 also serves the aesthetic function of improving the overall appearance of the liquid dispenser . finally , alcove adaptor 200 also limits the entry of moisture - laden air from the surrounding atmosphere to the region adjacent cooling pan 64 , to limit condensation produced on pan 64 . referring to fig2 alcove adaptor 200 can be assembled to the reservoir assembly through the use of struts 202 on alcove adaptor 200 , which pass through openings within alcove insulation 87 ( which mates with the shell 85 ), and connect to locating posts 83a and 83b on reservoir 80 . in the &# 34 ; cook and cold &# 34 ; embodiment shown , for example , in fig3 the ends of liquid conduits 90a and 90b would pass through the alcove openings 206 and 205 , respectively , shown in fig2 . faucets 51 and 52 , now properly positioned within alcove openings 206 and 205 , respectively , are then passed through alcove opening 61 of alcove housing 60 . alcove adaptor 200 is positioned by disposing its side edges within slots 240 on the rear of alcove housing 60 ( shown in fig1 - 18 , and described below ). with the &# 34 ; hot and cold &# 34 ; embodiment , alcove opening 206 is preferably open on its bottom edge , since &# 34 ; hot &# 34 ; faucet 51 is permanently attached to hose 188 of hot tank 130 , and this facilitates connection with faucet 51 . an alcove adaptor locator 210 can then be fitted within alcove opening 206 to properly position hot faucet 51 . with a &# 34 ; hot and cold &# 34 ; embodiment , the reservoir 80 may be removed with cold faucet 52 remaining assembled to the reservoir , while hot faucet 51 remains permanently assembled to the housing . alternatively , with a &# 34 ; cook and cold &# 34 ; embodiment , the reservoir and both faucets are removable without any disassembly . this permits easy cleaning of the preferably all - plastic reservoir assembly . unlike known prior art liquid dispenser apparatus , the components of various housing assemblies , when used with the adaptors disclosed here , can be used with reservoir and liquid dispenser assemblies manufactured by others . for example , and turning now to fig1 - 14 , an alcove adaptor for use with a housing manufactured by sunroc and designated generally as 220 is illustrated . the sunroc alcove adaptor 220 differs in height from alcove adaptor 200 , and openings 223 and 225 are spaced from each other a different distance than openings 205 and 206 of alcove adaptor 200 . ledge 227 of the sunroc adaptor differs in length from ledge 203 of alcove adaptor 200 , and includes an upwardly extending lip 229 . the structural features of the sunroc adaptor 220 facilitate the connection of the external housing components of the present invention to a dispenser manufactured by sunroc . as shown at fig1 , the sunroc alcove adaptor 220 is positioned over alcove opening 60 and slots 240 . turning now to fig1 - 18 , another alcove adaptor 240 is illustrated . this adaptor allows the housing of the present invention to be assembled with an ebco dispenser . the alcove adaptor 200 again differs in height and hole spacing from the other two alcove adaptors 200 and 220 already described , and functions in a similar manner to that described with reference to those adaptors . the reservoir assembly may be formed from any suitable nontoxic and noncorrosive material . preferably , it is formed from plastic materials , such as polypropylene , which provide structural strength and rigidity while resisting fracturing . such materials are preferably easily cleaned and resistant to algae formation or the adhesion of other biological substances that can form in water remaining relatively stagnant for a period of time . in an alternative embodiment , the liquid container or source , rather than an inverted bottle or carboy , could be a continuous , piped liquid supply , or other liquid container or source . in still other alternative embodiments , the liquid valve dispensing means can consist of structures other than faucets , and need not be located in a side - by - side spaced relationship , or need not even be located on the same housing wall portion . in yet another alternative embodiment , the present invention may include at least a second liquid reservoir provided with its own liquid valve means similar to those described above . an electrical heating element and thermostat may be provided , located preferably externally to and adjacent or in contact with one of the reservoirs . suitable insulation material may be provided between the first reservoir , which can be cooled , and the second reservoir , which can be heated . in still another alternative embodiment , alternative designs from the alcove housing and configuring alcove adaptors ( the &# 34 ; alcove assembly &# 34 ;) shown here can be provided , for connection to various external housings of different manufacturers . these alternative designs may include a configurable upper housing , for example , rather than the selection of a particular alcove adaptor for use with a particular external housing . of course , it should be understood that various changes and modifications to the preferred embodiments described herein will be apparent to those skilled in the art . for example , an alcove housing need not even be used , as long as some structure is provided to ensure the proper location and position of the liquid conduits tubes from the reservoir assembly , and their connection to the faucets . other changes and modifications , such as those expressed here or others left unexpressed but apparent to those of ordinary skill in the art , can be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages . it is , therefore , intended that such changes and modifications be covered by the following claims .