I just got back from a weekend trip to NY and had a neighbor keeping an eye on my flock for me. I didn't want her to have to bother carrying fresh water out every morning so before I left, I purchased the (blue) one gallon heated dog water bowl from TSC. I filled it with sand, then a clay pot base and set my plastic poultry waterer on top of that. Haven't had a chance to talk to my neighbor yet but this morning when I went out - and it was only 10 degrees this a.m. - the water wasn't frozen. I think I'm going to remove the clay base so the poultry waterer is nesting right in the sand, that might be better if temps drop below zero. But it definitely seems to work and I think I'll keep it in place for the winter. I only have seven chickens so it's a small set up.