Like Pavlov's, two of my pet submissives have been trained to respond to the summons of a bell at my slave zoo in in the country in order that they can be fed or watered in whichever way I choose. The rickety bridge over a canyon in the grounds provides a handy spot to quench their thirst because any of the flow they fail to swallow naturally drips down into the canyon below. It means these lucky slaves get an unrivalled view of their Mistress without her panties on, but I can of course punish them for peeking at my body later.