For your waterer, use a five gallon bucket, gamma lid and horizontal nipples. In the winter put a stock tank deicer in the bucket and you will be good, if you can get electric to your coop.
I tried a horizontal nipple and a stock tank deicer in my water bucket last winter and it froze solid. I put foam insulation under my bucket around the vertical nipples then another bottom from a bucket and switched from a stock tank deicer to a submersible bucket heater and my vertical nipples stayed working down to 1°F in my drafty run.

JT