I have a store bought waterer but for the big girls I cut the bottom out of 5 gal plastic bucket and left about 3 inches all around the bottom they seem to do well with that. I thought they might get in and scratch around and spill it everywhere but they pick it clean with no mess
Many different ways to go about this. You can get free food grade plastic buckets at deli's or grocery stores that have deli's. All you have to do is ask.