I assume when you say water park you mean one with slides rather than pools and sprayers?
Bring a stroller and bring your own snacks. The worst that will happen is that they will tell you to get rid of the snack that you are currently feeding him and I bet if you find a quiet space and you aren't obtrusive then they won't even notice.
I find that it is better to over pack and overplan than underpack and underplan.
My neice went to a water park when she was 2. My BIL said that she didn't really appreciate it (have much fun) because she was too young. She had more fun when she was 3. There may be a lot of things that you can't do with a two year old, so you may want to plan on bringing toys for him to play with. Make sure that you have a big floppy water hat. I would bring a couple changes of clothes and some plastic bags to put wet stuff in. That way if he can't nap comfortably in wet trunks then you can change him and change him again into new trunks to play more after his nap.
Bring a stroller and bring your own snacks. The worst that will happen is that they will tell you to get rid of the snack that you are currently feeding him and I bet if you find a quiet space and you aren't obtrusive then they won't even notice.
I find that it is better to over pack and overplan than underpack and underplan.
My neice went to a water park when she was 2. My BIL said that she didn't really appreciate it (have much fun) because she was too young. She had more fun when she was 3. There may be a lot of things that you can't do with a two year old, so you may want to plan on bringing toys for him to play with. Make sure that you have a big floppy water hat. I would bring a couple changes of clothes and some plastic bags to put wet stuff in. That way if he can't nap comfortably in wet trunks then you can change him and change him again into new trunks to play more after his nap.