We are new to chickens and I am trying to decide what kind of waterers to get. My ultimate watering system would be something I can fill from the top without having to dump something upside down and something I can keep from freezing in the winter. I was considering a bucket with one of those cup and hose attachments but how do you keep the water in the hose and cup from freezing? They make submersable heaters to place inside the bucket right? What if the mechanism that keeps water in the bowl breaks? Are they reliable? What do you use?