flowerbug
Garden Master
For winter I used this in Northwest Arkansas. It's a rubber bowl so if it freezes solid I banged it on the ground until I broke the ice out, then refilled it. If it is outside in the sun it stays thawed into the teens. Not all days are sunny and it obviously freezes overnight when it get cold enough. To keep the chickens from turning it over when they perched on the edge I cut a hole in a piece of plywood and used 2x4's to raise it a little. They will poop in it so you have to dump it daily. It's low-tech but it worked for me.
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If I were to try to heat water I'd do what Thistle does, a heated dog bowl. I ran electric cords to my brooder in the coop. Other than the normal things you concern yourself with electrical cords the only thing I worried about was them perching on a suspended cord and unplugging it so I secured the ends or strapped it to the walls.
that's a nice low tech way to take care of that!
for when i run cords that i think might be subject to being pulled apart i tie a very loose knot around the plugs with the cord (not tight enough to put any stress on the plugs).