For keeping the water from freezing, we are using a submersible aquarium heater (with an auto-shutoff if the water level drops too low). It made the difference between a solid block of ice and (on a colder night) a bucket of cold water.
Our waterer is a 5 gallon bucket with steel/plastic nipple valves in the bottom. They tend to get a little ice seal over the valve even before the rest of the water freezes.
Our waterer is a 5 gallon bucket with steel/plastic nipple valves in the bottom. They tend to get a little ice seal over the valve even before the rest of the water freezes.