I have a cat who protects his territory! Like most cats he will chase other cats out of his yard and this can lead to fights. I was looking for a safe way to break up cat-fights without getting hurt in the process when my mother told me of her "secret weapon".
She buys several of those big squirt guns and keeps one on the front porch and she will get ready to hit one or both of the cats with a long shot of water. In an emergency, this is much faster than turning on the hose and it's safer than getting bitten.
My mother originally bought the long range squirt gun to stop her cat from climbing over her fence. It only took two attempts at escape, and now her cat stays in the yard! Just be sure you let children know this is only an emergency tool and it's only used for the cat's safety. Never tease or be cruel to an animal!
Super Soakers can squirt up to 50 feet and they are a toy made for kids, so they should be safe, but you should still use care to not pump them up very much so they have less pressure; this will increase the safety factor. They cost around $10.
By Cyinda
If your cats fight over food, separate cat food bowls where they cannot see one another eating; or in more flowery terms, here is a poem which describes this tip.