I'm thinking ahead to winter and how I will water my 5 chickens in their 4'x4'x4' coop this winter. We live in Michigan where night time temps can get into the teens. I really don't need anything elaborate since we just have 5 chickens. I would like something that they can't poop in. I have the standard couple-gallon waterer that I was thinking I could use the cookie tin with 40 watt light bulb under which has been posted here a few times, but I don't want something that will get poop in, so I'm shying away from this option. Below is some pictures of the cookie tin heater that I made a few months ago. My chickens currently drink out of the pvc-nipple system tied to a 5 gallon bucket and it works great. I only add water ever few weeks, but this won't work in the winter because it will freeze. Attached are some pictures of this waterer. I'm leaning toward some 64 oz bottles with nipples attached in the tops. I have a couple of these already made and they work, but I just can't come up with a way to keep them warm so that they don't freeze in the winter. Attached are some pics of these too. I like the nipple watering system because the water remain clean...... I just need to get some ideas how to accomplish this in winter temps. Suggestions???????????