I saw this set-up at another's guys coop and decided to go that route at my coop. He had as section of "hog panel" on the wall that had openings of 2"x6". Outside the chicken wire he had a heated dog water bowl. The hens would lean thru the hog panel to get a drink. Wow! Now the water stays cleaner and I can change it and add more water without even going into the pen.