This system keeps water super clean and refills as needed. In all, I spent about 45$ on this project and it was really easy.
The bucket is connected to a low flow adapter to the garden hose, reducing the psi. Inside the bucket is a float flow regulator- like the kind in toilets; when the float drops, more water is added until it rises again.
The pcv piping holds an additional 2 gallons of water and includes an air vent and overflow as well as two screw off ends for easy cleaning and debris removal.
Super satisfying project and no sooner did I put it into the coop, the chickens figured it right out.