I'm in ND and am worried about the water situation in my coop. I will be getting chickens tomorrow. I am thinking of buying a heated base for the waterer but all waterers i've looked at even dog bowls they only work till 10 degrees. Even the heated dog bowl I have for the outdoor cat stops working at temps below zero, at that point cat goes in garage. Do you put the chickens inside when it starts dipping that far below the donut or do you just keep up the water supply when it freezes? Thanks!