I know it doesn't fit the nice warm concept of Texas, but at the old house I would occasionally have to deal with water freezing in the toilet. More often than that though, I would find the water in my water glass beside my bed would have ice in it by 3 or 4 in the morning. I usually need a drink of water in the middle of the night - but in that kind of cold I never liked *ice* water!
Still, I miss the old place. It was VEY homey - if I ever go back though, that house will be demolished and a new one *with* heat will be built!