Ah. I thought you were saying your ducks could not use them at all. Gotcha. The buckets I have are for the ducks to drink/dunk/clean eyes and nostrils. But they'll drink from anything I put out there.
Nipples! So much better, imo. I have nipples, cups, buckets, and those default plastic waterers. Nipples have never failed me, and they keep the run drier!
For 32 chickens? Hmmmm.... I really don't know. I'd probably do a lot in multiple places to make sure everybody gets what they need. Maybe...