And a frig with ice and water in the door. You could install a peck valve like chicken nipples have so they could dispense it at will. No really. e
You could simply put a container in a regular dorm size fridge and drill a hole with a tip out for the nipple, just need to be sure there is nothing in the way when you drill... This is how many DIYers make chillers for cold water fish tanks, drill two holes in a fridge, take a coil of hose and put it in the fridge, with both ends sticking out though the holes, hook it up to a pump that circulates the water in the tank trough the coil in the fridge, presto instant chilled fish tank... I had a friend that did this so he could keep a pet lobster, worked quite well...