I've never seen or used drinker cups, I searched ebay for drinker cups and found the following cup types This one And this one I know the first cup works by pressing that yellow thing but the second cup doesn't have that. How do they work. The first type are expensive while the other one are not that expensive-, does this mean the second type isn't that good and reliable? I need help comparing and buying the cups. I have about 150 chickens so how many cups do I need? Thanks.