For the past three days my cat has been having diarrhea, well it's very soft and has some watery poop also. I'm very worried I don't feed my cat people food, I give him 9 lives dried food, also always keep water for him to drink. He's been eating normally but he's kind of calmer than usual like he may not want to play a lot because his tummy might hurt.
Hes gone outside his box three times, I'm very worried. Please help!

Of course, my first suggestion is to take him to the vet to check this out. (Meanwhile, please get him neutered. It an easy operation for male cats, and he will be healthier and happier for it.)

My cats love Fancy Feast and do well on it. Is it possible to try a can or two of that to see if he does better with that brand? It IS more expensive, though. I also feed them dry cat food which might help your cat too.

Back to my original suggestion -- please take him to a vet.