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Super simple. Drill a 3/8" hole in the cap (make sure that the rubbery circular piece inside the top of the cap stays put, otherwise it'll leak) and insert the push-in style nipple. I think some nipple waterers need different hole sizes drilled so whatever you buy, check to see what it requires. Just plug in the black piece and shove the red piece through that and hang upside down. I poked a hole in the bottom of this bottle and use a caribeaner to hang it on the hardware cloth in the run for the chicks. I fill it with a funnel through the hole.