I recently read somewhere on BYC a comment about grandparents who had chickens and they had a water "pit" below the frost level, so that it would not freeze in winter. I can't find the comment again, and don't remember who said it. Does anyone know anything about such a thing, or how to build one? I think this is what I would like to do for my chickens in winter, the alternative is to take their waterer inside and swap it out a couple times per day.