That would be very interesting, but as the others were saying. Water has too many impurities, and then the heat would be too inconsistent as most animals need a constant climate.
Spill? That would be too fun, spilling it in your room, office, etc.. you'd get water and fish.
I like JDaddy's, lol Jdaddy, idea about splitting it.
PSU would also have to be out of water, wouldn't it?