Guess you'll have to decide to use bowls and change them or go with a heated waterer.I’m in West Virginia. In the higher mountain part. I intend to have a light in their coop but no heating.
Here it can stay well below freezing, day and night, for weeks on end.
So if you have a light, you've got power in coop.
Is light for you to see or supplemental light for winter laying?