I use horse stall waters. They are just a bowl with a float on them. http://www.horse.com/item/automatic-waterer/SLT700548/ I don't remember paying that much for them but it's been quite a while since I bought them. I tried the nipple waterers but the chickens just weren't getting enough water to help with the heat we have here. When my hens get hot they splash around in the water and cool down. When the water is dirty I just take a sponge and wipe out the bowl and once a week I use a sponge with bleach water to clean all the bowls, horses, dogs, turkeys and chickens.
