I just make sure that twice each day, I change the water and they will quickly learn this routine in the winter and drink when it's available. Of course, if you want to spoil them, take a bucket of hot water to the barn.
The stock tank heater was one of the best investments I ever made. It was like $30 . I never have to deal with frozen water again. I still have to haul it when the water in the barn freezes but that's an other story.
I know under the rabbit forum they were talking about Glycerin to keep th water bottles from freezing, I have electric bucks for the goats & in the winter I change the water dishes(I only use the bottles when it quits freezing here in spring) for the rabbits 3 times day. It's a pain for the bunnies but that's what I do. Never tried the glycerin but someone there might know more about it.
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