I like the idea of the lid to keep the water clean. I think you would want to fill it very carefully to keep bacteria or mold from forming. These things grow unseen, in a closed container. Personally, I would add a fourth cup of apple cider vinegar to that sized cooler. It is good for the chickens (ducks, whatever) and helps keep down any bacteria. It is easier to clean than a pvc pipe, with a design to water. We gave up on ours as it was cumbersome and difficult to clean out. I agree it needs to be set up on something to keep the cups clean, over wise you end up with the same situation you have with a rubber bowl, or even the other waters. The ones I use now have a dome, but the water coming out th bottom into the ring, still gets dirty fast and has to be taken apart. Thanks for sharing NJ.