Update: with the milk jugs rearranged, they drank only about an inch of water from the neck down, so that's not a lot of water( 25 LF); I replaced their usual waterer and they flocked to it crowding around it. THe outside one is used, but no more than the inside ones. I'm at a loss as to why they are not using them enough to meet their water needs.
I'm not going to give up; I don't like cleaning the old type; the nipple waterers have me spoiled already! LOL
I have some younger birds; I'll set up a nipple waterer today to get them going and learn while they are young. THe more that use the nipple waterers the better!!
Thanks for everyone suggestions.
THis thought jumped into my head: can I coat the nipple with something tastey to encourage more pecking BUT not gum up the mechanism????