Hi Angelica,
Welcome to the Disney Parks Moms Panel. I can feel your excitement and I am excited for you! There is nothing like your first visit to Walt Disney World. I have a feeling your kids will have a blast!
You may absolutely visit the theme parks and the water parks on different days. Whether you have added the Water Parks Fun & More option to your
theme park tickets or you have separately purchased
water park tickets, how you use them is entirely up to you.
When you visit a theme park, you will use a theme park ticket. When you visit a water park, you will use a water park ticket or one of the visits in your Water Park Fun & More Option. This means you can choose to do both in one day, one per day or even take a day off in between. You'll just need to use all of your tickets and any options added within 14-days of first use.
I hope this helps you plan a splashtacular vacation, Angelica! Wishing you
many happy memories with your family.
Andrea U.