If the kitten was in his normal environment it is not likely that he's mad at you.

He should be just as energetic and playful as ever. Not playing and not eating rather can be a sign of an infection. Have you noticed whether he used the litterbox as usual?

What you describe about the water sounds more as if he likes to play with it- which is rather normal.

I would wait a day before taking him in- it may happen that they are a day under the weather and get back to normal. But if he doesn't play and eat like usual tomorrow I would check.

Good luck for you and your cat