When it's so cold that the chickens won't come out to drink water, I put a bowl of snow in the coop. I do not put water in the coop. No way for me to make certain it does not get dumped, which would be WAY too much moisture/humidity in the coop.
Mine will nosh on the snow. When they want to come out, they get a drink from the bowl.
Mine will nosh on the snow. When they want to come out, they get a drink from the bowl.