Actually, I was thinking of the algae/slime control only. I assumed it would not harm chickens. Gave no thought to whether it would help them.
Oh well, bad experiment design.
Since you have a scientific bent, why not do a controlled study?
Lots of people post that they think it works. Have they tested it and published the results of their test? You could be the first!
Maybe set up two waterers. Add ACV water to one and plain water to the other. Maintain them under...