In a particularly advantageous embodiment of {TAIL ~ 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 the reservoir in a position to permit at least partial emptying of the liquid contents of the reservoir into {HEAD ~ the trough} 
In a particularly advantageous embodiment of { TAIL ~ 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 the reservoir in a position to permit at least partial emptying of the liquid contents of the reservoir into { HEAD ~ the trough }
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