Did you introduce the two cats slowly or did you just put them together from the start? The way they are introduced can really make a difference. Maybe you could confine them from each other for a few days or more and slowly introduce them again.
There are a few products that help cats to relax and get along better like Rescue Remedy (I think you put that in their water) and Feliway (you spray it in the air or use a diffuser that plugs in an outlet). I've tried Feliway and it helps a little and I know several people here have had success with Rescue Remedy. They are both available at pet stores.
Have you talked to vet about this? Sometimes they can give kitty Prozac to cats to calm them down.
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