Hamster waterers will work fine, I'm using 1/2 gallon "Water Wells" from TSC. I've got 3, one of them is leaking though, the lid isn't seating correctly right now - this is why I'm glad I have three, I have two sets of chickens and the 3rd is a reserve. I'll have to figure out what's going on tomorrow. The chickens love them though, and there's no muddy mess, no poopy water, it's great.