Around 3-4 weeks ago, i rescued an orphaned kitten from my backyard. He was around 3 weeks old then, and now he is 6-7 weeks old. He has really come out of his shell since i've had him, but he always bites peoples hands and feet when he wants to play. I've tried saying "no" in a firm voice and locking him in another room for around 5-10 minutes, and when i get him out, he doesn't bite for a minute or two and then goes straight back to biting again. I know he is just playing, but i don't want him to continue this habit as it could be really painful when he is older. He prefers to bite us instead of his toys. What can i do to get him to stop? Should i spray him with water?