I just recently installed a Nipple waterer with 2 nipples for my 2 girls and they don't get it. I've tried to show them, removing other water sources, keeping them contained in the run (instead of free ranging like usual) and they don't get it. I read that they will eventually get thirsty enough and figure it out, but we're on day 3 and it's not happening. Tips or advice on how you get hens to drink? Thank you.