Make a heated 5 gallon chicken waterer with horizontal nipples. It's easy, cheap, and works! Depending on chicken numbers it will last a week or more. You can hang it from a rafter or set it on cinder blocks. Mine worked down to 20 below zero over a week long stretch. In the morning at those temps there would be a little ice ball on the nipple but I melted it off with finger and thumb and depressed the plunger to make sure water flowed and it stayed thawed and operational all day. The chickens don't drink at night anyway. Bucket and lid you can probably get from the local walmart bakery for free. The heater cost I think $39. The broken bricks at the bottom to act as a heat sink were just lying about the place, so free. Rocks would have done as good. The horizontal nipples are pretty cheap as well; 10 for $14.00.
https://www.amazon.com/Horizontal-M...ocphy=9028359&hvtargid=pla-441262673698&psc=1 Put 4-5 of them around the bottom of the bucket ~2-3" up.
<--- Don't use the ones with a "cup" to catch the water as the water it catches will freeze. The nipple will no longer work, and it could break the nipple.