I use a heated water container or add a heater to a water container. My coop is wired for electric, but I've run a long heavy duty outdoor cord to a chicken tractor, too.
If electric isn't an option, you do need to carry water out to them. Most people that do this do it early in the day and again late in the day. Black rubber bowls from the farm store work the best for this. It's easier to knock the ice out and they don't break.
I don't heat the coop. I just provide a good coop, good food and water. They do fine.