Here is what I have. I bought them on ebay and then set up the system. The water is fed by gravity from a bucket. Leaking is not my problem. Filling the cups is the problem.

I manually feed water into a 5 gallon drum and that feeds by gravity into a hose that is attached to the pvc pipe with the cups. The cups each have a little yellow valve that I originally thought worked like a floating device that was activated by the water getting too low. But it only seems to work when it is pushed on either up or down. The water seems to have effect on it. And my chickens seem too stupid to figure it out. I've had to go out each day to push on the yellow thing or the cups are empty. Does anyone have experience with a system like this and do you have any advice for me?
I manually feed water into a 5 gallon drum and that feeds by gravity into a hose that is attached to the pvc pipe with the cups. The cups each have a little yellow valve that I originally thought worked like a floating device that was activated by the water getting too low. But it only seems to work when it is pushed on either up or down. The water seems to have effect on it. And my chickens seem too stupid to figure it out. I've had to go out each day to push on the yellow thing or the cups are empty. Does anyone have experience with a system like this and do you have any advice for me?