Just a simple question, what would be the best type of waterer for my almost finished coop that is 8 x8 that you can walk in? I need something that will not freeze in the cold winter, at least 4 gal and a way to keep pine shavings out. I thought about one of those galvanized hanging containers and lower it to a heated base in the winter, i just want to make the right choice. Thanks for any help.