I have some of those red automatic drinking cups in my run. They are attached using flexible plastic pipe to one of those 3 gallon beverage dispensers. I know the water won't freeze in the beverage dispenser themselves, but will it freeze in the pipe or the cups. The pipe runs through their coop to the run outside, so not all of it is exposed to the elements. Some of it is also covered in foam. My setup in the run kind of looks like this except instead of pvc, just some flexible clear plastic tubing.