Hi, I am looking to buy a waterer for my chickens. I would like one that is solar-powered, but am guessing that doesn't exist. Is their such a thing as a battery powered waterer? I don't need it to be an automatic waterer hooked up to a water supply, just something to keep it warm enough in Massachusetts so it doesnt' freeze. Any ideas? Thanks, Jamelle ps I received $70 for my birthday. I will kick in a little myself, but would like to keepp it around $90 total.