Well, I sure don't like to be the one to say this, but from all of my experience, and my friend's who have multiple cats, this is a problem that sometimes resolves itself, and then again, sometimes doesn't.
My eldest, who is a male, by the way, just does NOT LIKE a couple of my cats. No matter what I have done, he is never going to change, so I have learned to keep him out for part of the day, in the main part of the house, and then put him in the bedroom with the cats he does get along with, and then let the other couple out.
Males, especially, are VERY DOMINANT and if he was neutered late, that can also contribute to the problem. Even females, like to be the "TOP QUEEN", and I have one cat like that. She is the smallest cat I have, and she goes after the big boys!
I don't like to take any chances with any of the ones that have issues with each other, getting hurt, so I have just decided to keep things the way they are. Water DOES NOT affect my eldest male, that is very dominant. He just watches for when I am not looking and will literally attack the two cats he does not like, for whatever reason, I do not know. The two he goes after are also males. The one male he goes after is "passively aggressive", whereas the oldest male is plain "aggressive". There is a difference, and so many studies have been done, and so many people have different answers, but it is really up to you, and how you will learn to deal with this problem.
The more cats you have, the harder it will be to keep these kinds of problems from happening.
I also have a friend who just lets her cats go to it, but I do not agree with that theory, as it is not good to see a cat get scratched or hurt really bad, especially on a weekend, when you might have to run the bleeding cat to an emergency vet clinic, at the high cost they charge.
God bless and take care and I hope you can write back and let us know if your cats are male, or are they all female? I see that you mentioned one as being a "she", but are the others also female?
One thing you may want to try is "Feliway Diffuser" sold in pet stores, that may help calm them down. Also, another product is "Pet Sedate", that helps with these types of problems. Plus another product is "Rescue Remedy". I have rubbed little bits of that in the ears of my cats that are agressive, and it has helped "a little bit".
Good luck!
Elena Marie
"Open your heart to learn all you can in this life, and to give to others, the joy and satisfaction that they may remember you as a true friend."