Ok, I'm building a coop and trying to plan a waterer for inside. I have 3 hens in a 4x4' coop and was hoping to use a Simply Orange juice bottle to make the nipple style waterer. Because the coop is not that tall, I would rather use one of the cup style waterers that could pop out of the side of the juice bottle (having the nipple out the bottom would be a little bit low to the ground). Has anyone used a cup style waterer directly on a container rather than through a PVC or tube? The one I found here http://www.twincitypoultrysupplies.com/store/index.php?main_page=product_info&products_id=399 says that it's gravity fed. Thanks for any tips!! I put a little sketch of my coop design on My Page. The shortest part (exterior walls) will be 27" and then the tallest (at the peak)will be nearly 4'. I just dont want to have to hang the waterer right in the middle there.