Hmm, what to do. I wonder if there is an easy way to heat the water slightly. Do you think the bucket method would be better?
Because my climate is so mild I just bring the waterers in at night or replace them on the rare days it's below freezing all day.
People in cold climates have many ways of dealing with their water and preventing it from freezing with different kinds of heated waterer. You can probably start with a search on the site to get some good ideas.
