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Furthermore, what happens if a kitten eats cat food?
Kitten food tends to be higher in calories, but it also contains some vital nutrients that a growing kitten needs. It won't harm the adult cat to eat kitten food, other than consuming the extra calories, but the kitten definitely shouldn't be eating food formulated for adult cats.
Then, when should kittens start drinking water?
Drinking Water At around 4 weeks old, as soon as kittens start eating foods that aren't their mother's milk, it is crucial that the fluff balls always have clean water available to them -- in a shallow water bowl that is convenient to lap up, of course.
IMO unless the kittens is sick or has problems with weight, there is really no need to keep the average size cat on kitten food longer then 4-5 months. After that they are put on adult food and maintain their weight and growth as normal.