How much Bach Rescue Remedy do I give my kitten?

I bought a small bottle of Bach Rescue Remedy from a health food store today. I know to put 4 drops in a glass of water or under my tongue, but how much do I put in my 3 month old kitten’s water to calm him down? I know you can’t really give too much since it’s natural stuff, but it was expensive so I don’t want to waste it when less would do. Thanks.
My kitten attacks me constantly, and even bit both my parents. My mother has the meanest cat I’ve ever met and even he never attacked anyone this much. I wouldn’t go out and buy a tiny bottle of stuff for if I hadn’t already run out of options. I put one drop in his huge water bowl. I think he’ll live.