I had to dehydrate my chickens on to the nipple, hehe. Not only that, but I left them in the coop till they figured it out. I kept showwing them by flicking it, making a pecking sound, and sure enough the lead cockerel came over, tried it, and then everyone did it. They all took turns figuring out the nipple, and now they do it like its no big thing. HOWEVER
When I let them out on the range, they forget all about the nipple, and if I don't have a range water source, they forget to drink,lol. The way I solved this was to teach them to use ONLY chicken nipples. I made 2 replicas of the water and nipples inside the coop, but this time put them 1 in the pasture on their range and 1 by the coop, but outside by where I feed them. The chickens only source of water are the buckets with chicken nipples.
After locking them in their coop for a couple days, 4 days in fact. I found is long enough for them to get with the program. Anyway after 4 days, let them outside. They will be happy you did. Give them some scratch and show them the chicken nipple. The key to all of this is the complete removal of all pan waterer's and dishes or whateva you were using. They need to understand that the nipple is the water source.