I am very hesitant about using any type of heating source in my coop. It is a section of a 150 year old bank barn, and as much as enjoy the chickens I just can't risk starting a fire. I'm trying to come up with ideas on keeping the water from freezing this winter- I know I can't prevent it completely without heating it, but I'm hoping someone has some ideas on at least slowing down the process. Does molasses or ACV really work? Or has anyone made a waterer out of a thermos or cooler before- I thought if I start out with warm water that would insulate it for a while at least. Thanks in advance for any advice!