I just switch over from the "normal" waterer because I was going out there daily to clean all the dirt they fling into the tray. Even when I hung it off the ground. I just made a 5-gallon nipple system. It's the traditional vertical style and thus far it's working wonders. I found a video from a guy that took the install a few steps further than normal and it's turned out great for me.
There were a lot of reviews, good and bad, on the nipples so I was worried about them. People said they leak a lot. Mine this far have not and the nipples do hold a droplet of water on them, but I never see it fall.
The way I made it better was instead of drilling out the hole normally, I used a 21/64 drill bit to drill the hole. Then used a 1/8 NTP (threader) to make threads in the hole. That way the nipples screw in. On top of that I used brass 1/8th nuts to secure the nipples from the inside of the bucket. Of course you have to be gentle all the way around because it's plastic and easily can be stripped.
It doesn't take the chickens long to figure out what it is!