Yes, definitely get your chickens well & used to their new home before switching their water. I think the younger they start, the easier, but my orig chickens (at 3-4 month old) learned quickly. I had a drip pan under the vertical nipples. The dumbest ones tried drinking out of there for a day or so. Eventually they saw their smarter siblings drinking from the nipples & caught on. As soon as one "gets it" the others will follow.I acquired 4 teenage chicks and put the usual horizontal nipple waterer out for them. I 'demonstrated', but they didn't get it. A few days later I switched to vertical nipples, again demonstrated, and they didn't get it. I think that they got sick after they arrived, so am treating them. May have arrived with whatever they have --- doesn't matter. Just have to get them well.
Anyway, finally I just put the water (with medication) in a regular water fountain and they drink it right up. I'll have to use that until everyone is well. Either these chicks are really dumb, or more likely, they have been sick and just didn't 'get it' with the nipple waterers. I believe that they're on the mend, so will try again when everyone is well. They've had a harsh transition. Thanks for others' advice.