Jared, this is not all the info you need, but you should certainly remove the waterer at night. Chickens don't eat or drink in the dark, and the presence of water in the coop raises the humidity level, increasing the possibility of frostbite on combs and wattles. This is especially dangerous for roosters, which you do not have, but hens are not immune. This will also keep the water from freezing overnight and you can take them warm water out in the morning.