I've hurt my knee and can't really go back and forth from the coop 4 or 5 times a day because their water is frozen. Luckily is has been kind of warm here. I'm going to use a cookie tin water heater with a stainless steel bowl on top and put some bricks around it so the bowl cant get scooted of the cookie tin. They way that is made, the bottom of the water bowl will be about 3" below thier feet and the water level might be about feet level when topped off. Do chickens have any problem drinking water below their feet? I don't want them to go thirsty because they cant bend over far enough or something to get to the water.