We have chickens in an insulated coop 8x12 with 8x8 for the chicks and 8x4 for storage and are thinking we want to add some meat rabbits. I know all about how to keep chicken waterers from freezing. But, I have not read anything about how to keep rabbit waterers from freezing. Either I have not read enough, or I have missed it. We live outside of Billings MT, which is probably milder than the rest of the state, but we still have belowing freezing temps in the winter. Any suggestion would be greatly appreciated. I know it is June.....just planning and preparing now. Thank-you!