I know that chickens have been raised before without it, but it is a good idea. The originial coop had power in it and the lights were nice, but I had the water heater in the winter time. On some of those cold days in Indiana, even that water heater could not keep up. Would it be ok to just have one of those HD rubber bowls and beat the ice out of it in the winter time every time I check on them or should I have power for a constant water supply?