I'm in a different climate than you and I water outside, so what I do probably would not work for you. The coldest it got here last year was only 4 degrees Fahrenheit. That's tropical compared to some others on here. I set a black rubber bowl in the sun. When the ice freezes in it, like it does overnight, I just turn it over and stomp the ice out. It does not always stay thawed during the day, that depends on how cold it really gets and how much sunshine I get, but it works for me.
There are several different ways to keep it thawed. I suggest building a stable platform up out of the litter and firmly attach your waterer up there or have it heavy enough, even when empty, so they cannot turn it over. That way it is up out of the litter, which reduces the fire danger, and they don't scratch so much litter and trash in it. Hang something over it so they can't try to perch on top of it. Firmly attach any electrical cable you run to it so they cannot scratch it loose or perch on it. Make the platform big enough so they can stand up there and drink. Don't make the platform so high that they want to roost on it instead of the roosts.
I don't do it this way. I have no experience with it, so take it for what it is worth. If I had to do it, this is how I would attempt it. Maybe you can get something out of this that helps. Good luck!
There are several different ways to keep it thawed. I suggest building a stable platform up out of the litter and firmly attach your waterer up there or have it heavy enough, even when empty, so they cannot turn it over. That way it is up out of the litter, which reduces the fire danger, and they don't scratch so much litter and trash in it. Hang something over it so they can't try to perch on top of it. Firmly attach any electrical cable you run to it so they cannot scratch it loose or perch on it. Make the platform big enough so they can stand up there and drink. Don't make the platform so high that they want to roost on it instead of the roosts.
I don't do it this way. I have no experience with it, so take it for what it is worth. If I had to do it, this is how I would attempt it. Maybe you can get something out of this that helps. Good luck!