I am thinking of using a 55 gallon drum to catch rainwater from the roof of the chicken coop. Then running a line of 2" PVC to the chicken run with poultry nipples. This all sounds good until I think of the winter here in Indiana. It's not horrible, but we do get freezing temps. Looking for ideas to keep the system from freezing. I've seen many use bird bath heaters, but not sure they would be large enough for a 55 gallon drum, and even so would the line of PVC need additional heating?