You never know when a scraped knee might happen. On top of that, bandages have a tendency to fall off after being in the water for a bit. Therefore, keeping a few band-aids on hand is never a bad idea when headed to the water park.
As mentioned earlier, playing in the water can definitely result in a big appetite. For this reason, you will definitely want to have some money or a credit card on hand for meals. Besides, you never know when you might want to do some souvenir shopping!
Of course, if you have a Disney Dining Plan, you can also use your credits to grab a meal or snack in the water parks.
10. Swimsuits and Dry Clothes
Most importantly of all, you will want to make sure you have both your swimsuits and a dry outfit.
Some people choose to arrive wearing their swimsuit and change into their packed dry clothes afterward. Others prefer to arrive fully clothed and change into swimsuits once in the park. Either way, you will want to have both things with you.