My son loves feeding his chickens but I can tell he gets a little bit frustrated by the screw on water devices. He has no thumbs and while he can do most anything, holding on to those jars which are usually slippery (and have a pretty large diameter) to unscrew them is tough for him. He is not complaining and would be insulted if I mentioned it, but I can see what is happening. Does anyone know of a different system without a screw on jar? I don't have enough running water out there for an automatic system.