I use the Royal Rooster brand with the self filling float valve cups. They learned how to use it right away. I placed a bowl of fresh water on a brick directly under the water cups, once they got used to drinking in that spot, removed the bowl and they still came right there to drink and naturally dipped their beaks into the float cups since the cups were only 1 inch above the water bowl.
If you have the valves that need to be pecked to refill, try placing a black dot with a sharpie in the valve, so they peck it thinking its a bug.
If you have the valves that need to be pecked to refill, try placing a black dot with a sharpie in the valve, so they peck it thinking its a bug.