i use a bell style waterer . we hooked it up to a five gallon bucket that sits on top of the coop and gravity feeds down to the waterer. there is a valve in the waterer that keeps it from over flowing. i like the fact i can fill up the bucket from the outside and its not breaking my back.plus you can't add medicines to metal containers. cost of waterer is 22/23 plus shipping from randall burkey.