That is a really great idea! I only have chicks right now so I have a question: is a full size bucket (5 gal) too tall for full grown chickens to drink from? How does that work? I really like that idea as I don't want them drinking much from the yard muck.
I only use a one gallon bucket for the open water offering I put outside the door of the run for when they come pounding out like a pack of wildebeest. For chicks, I'd just use a dog bowl or any container that suits their height. Just be careful that you don't use anything they may be able to fall into and drown (e.g. is too deep for them to stand in with their head above water).