I am in southern maine, it gets fairly cold in the winter... below freezing most days. I currently keep their water in the covered run because its less messy... I just fill up a low shoe box type bucket for them to drink out of... I know I need a proper waterer for the winter, but what is the cheapest thing I can get away with and that doesn't take up a lot of space in the coop and what will help the water not to freeze in the winter? what would you recommend... preferably something I can make myself and something thats under $10 if possible... thank you!