I use this for water. With my 8 hens and 1 roo, I need to fill it about once weekly. (More often if they are kicking around a lot of dust and the water itself can get a bit brown). The tin with the light bulb under it keeps it from freezing.... although with any sunshine at all during the day my coop gets well above freezing and retains alot of heat through the night. So there haven't been very many days (so far) this winter where the coop has actually been below freezing for long.

