Please read post #4 in this link, it should help you:I'm curious about this because I also struggle with some of my chickens. Some I have no problem administering meds but others will fight me to the death it seems like, so if it would actually work in water, I'd love to know this as well.
https://www.backyardchickens.com/threads/worms-in-chicken-poop.1575508/#post-26765905