We have been looking for different watering methods since my beloved started building our new coop. We are planting an herb garden under parts for our lil chickens to munch on as they want. We are tring to make the new coop as self sufficiant as possible. Does anyone know if they can be watered from our rain barrel. They normally are not considered potable water due to mosquitos around here. I am concerned if people can not drink it without chemicals added will that be the same for the chickens? I have had suggestion on another thread for the horizontal nipples for watering. I have also heard the self watering cups were good. Still looking for input before purchase, I would love it if it could be used with our rain barrel too!! 
