I have 1 mean old hen who is in jail! my problem is I have to figure out a way to keep water for from freezing. here is my crazy idea...I have a 1 quart insulated drink cup with a hole in the center of the cap for a straw. will it work to put a nipple where the straw hole is and hang it upside down? do you think the thermal walls will be enough to keep the water from freezing? it was 29F in the coop this a.m.