Hi all! I'm getting chickens in a few weeks, and I'm trying to plan coop management for the winter. In gardening, we can use water bottles to collect heat from the sun during the day, then put them in the greenhouse or cold frame at night, where they will slowly release the heat. So I'm wondering if it would work to use this method to keep my water from freezing overnight. Basically I'd paint water bottles black (non-toxic paint) and let them sit in a sunny location all day. I would then put the bottle(s) into the 5-gallon water bucket in the evening. Has anyone tried this?