I think I have found the right solution for me this year with watering without buying an expensive heated waterer, or trying to rig something that may or may not work. I am going to the nipple waterers and I'm going to use a 2 ltr. bottle for the container size. I am going to construct a wire harness or a hose strap on the wall to hold this to the appropriate height. This way, I can have bottles of water inside and warmed already each morning. Then I will take the frozen bottles inside and let them thaw out and replace their water, keep them by the back door for the next day. We used to do this with our rabbits, and the commercial growers use metal nipples, so I'm hoping this will work. The only problem I can forsee is maybe the nipples freezing up, for which I have a back up plan. The chickens usually avail themselves of the dog's water anyway and they have a heated bucket. Anyone else use this kind of watering system? It makes sense for the warmer months, as the water doesn't get dirty, will be easily visualized for water level and one could freeze their bottles overnight so the birds could have cold water in the summer months. We don't use bedding in our coop, so their won't be wet bedding to think about. This past winter we didn't have too many really freezing days that didn't warm up later. Anyway, its a thought. Anyone doing this and have anything to report on it?