My current setup for watering our 70 CX's. Chicken nipples in a piece of 1" PVC pipe. The water is gravity fed from a 55 gallon drum outside the shed. When I split them up into the growout pens in a couple weeks each pen will have the same water set up.
I have a PVC board with a gutter routed in and a drain through the floor in one end. Every few days I just have to take the board out and hose it down as it gets crapped on and bedding brought onto it clogging up the drain. I have the board elevated on a couple bricks to help reduce the amount of shavings that get kicked up onto it.
I've been using the chicken nipples for years both in the bottom of 5 gallon buckets or in a piece of pipe. By incorporating a toilet fill valve along with the nipples in a 5 gallon bucket you can have an auto fill waterer that you hardly have to do any service with. Keeps everything so much cleaner.