I need to find a creative way to keep the chicken water thawed over the winter. The chicken yard and coop/run are more than 200 feet from the nearest source of electricity, so in my opinion an extension cord is not an option. They roam freely in a fenced area during the day with water dishes in the yard and they are cooped at night (and occasionally during they day when they aren't let out for one reason or another) with a standard plastic waterer. Has anyone found a good way to keep water thawed without electricity? Are there solar products to keep the water liquid? Do the black rubbery livestock pans absorb enough sun-warmth to stay liquid? Have you come up with a clever trick?