With our first freezing temp last night I'm looking for a way to keep my water un-frozen for my 2 girls. I have a 2 liter soda bottle and a Juice jug with nipple waterers in the bottom. Would one of these submersible fish tank heaters work to put into the bottle and keep the water from freezing? Or do any of you have any tips for how you keep yours thawed over the winter? Bonus question, are Road Island White hens fairly cold hardy? I live near Charlotte, NC so blizzard conditions are un-likely. Thanks for any help!