For those fortunate to have electric in their coops, I find the heated water dishes, (bowls), my best solution. Biggest issue is sediment in bottom of dish from the feed on birds beaks. Nipplers can be useful but I just don't find them sufficient enough for the birds to get a really good drink of water. I take a 1/2 gallon milk jug near of water and sit it in water dish. If it floats, put a brick on top. It doesn't freeze and I use it to top off water dish as needed.