In a particularly advantageous embodiment of the invention, a bottle shaped reservoir is hingably connected to the trough at a location thereon which allows the bottle and trough to be connectively hinged apart from their nesting position, to one in which the trough is relatively horizontal, and {HEAD ~ the reservoir} in a position to permit {TAIL ~ at least partial emptying} of the liquid contents of the reservoir into the trough 
to permit
In a particularly advantageous embodiment of the invention , a bottle shaped reservoir is hingably connected to the trough at a location thereon which allows the bottle and trough to be connectively hinged apart from their nesting position , to one in which the trough is relatively horizontal , and { HEAD ~ the reservoir } in a position to permit { TAIL ~ at least partial emptying } of the liquid contents of the reservoir into the trough
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