It's also a good idea to put a heated dog water bowl or dog dish on cinder blocks so that:
1: the bowl isn't on the level with shavings or whatever medium you use for bedding in your coop, which will help keep the bowl cleaner.
2: it raises the level of the water bowl so the chickens don't have to bend over as far to get a drink of water.
If you don't want to use electricity for fear of an electrical fire, I'd go with the rubber bowl on a cinder block, for the same reasons I stated above.
Best of Luck and STAY WARM OUT THERE!
1: the bowl isn't on the level with shavings or whatever medium you use for bedding in your coop, which will help keep the bowl cleaner.
2: it raises the level of the water bowl so the chickens don't have to bend over as far to get a drink of water.
If you don't want to use electricity for fear of an electrical fire, I'd go with the rubber bowl on a cinder block, for the same reasons I stated above.
Best of Luck and STAY WARM OUT THERE!