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You mean like the tiles you would put on a back splash in a kitchen or tile the bathroom with?? I have a bunch of those somewhere. They are glazed though, is that going to matter??
Yes, standard glazed tiles will work just fine. Heat in boiling water and place in the bottom of the bucket. They will slow the water from freezing.
@bearfootfarm: I agree they won't prevent freezing but will buy some time. Northern Native Americans used this strategy through-out history!