Hi Holly!
OK, my head is exploding with pixie dust right now!!! But don't worry, I've gotcha covered! If I understand correctly, you are considering purchasing a basic 5 day Theme Park Pass with the
Water Park Fun n' More option - correct? If so, you will have 14 days from the first day you use the pass to use the options as you would like.
Since you are not purchasing the Park Hopper option, you MAY NOT visit more than one major theme park per day. However, you may use your Water Park Fun n' More options at any point during those 14 days. Have I made things more confusing?
Let's say that on Day 1 you visit the Magic Kingdom, followed by Epcot and Blizzard Beach the following day. You stay home and swim at your resort for a day, then head out to Animal Kingdom the next day. Waking up bright and early, you head over to Hollywood Studios, spend a while at Typhoon Lagoon and then wrap up the evening at Disney Quest. And so on and so on... As long as you don't visit more than one major theme park (Magic Kingdom, Hollywood Studios, Epcot and Animal Kingdom) you may use your fun options at any point during those 14 days.
Well, I hope that I have answered your question and that you have a fabulous vacation!
Much pixie dust,
Jackie S.