I agree, I would just give plain water and see what happens.I switch off with adding ACV, Molasses, (equine)RedCell, and a electrolyte/probiotic Mix, in their water and also offer plain water.
How old are your hens?
I have no idea about EDS, I have read about it in the past, but had to re-look it up.
https://www.merckvetmanual.com/poul...6/overview-of-egg-drop-syndrome-76-in-poultry