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Yes. I too have heard about folks putting tennis balls in their water buckets. I suspect that might help, but I'm not sure if it will work on those real, real cold days (might still help, though)
Sou can keep the waterer from freezing by placing it on top of a heat source. Lots of folks will use light bulbs.
This one is a great idea and I'd like to thank the poster for sharing
or buy one: