Hi, Chris!
Adding on the "Hopper" option does not effect your "Water Park Fun and More" options. If you have a 7 day park ticket, you have 7 Water Park Fun and More options. If you visit more than one water park in the same day, this will use up 2 of your Water Park options. You can also use your options at DisneyQuest, Wide World of Sports, 9 holes of golf, or for mini-golf before 4 p.m.
If you want to hop theme parks in the same day, you will need to add the Park Hopper option.
Both your park tickets and water park options are good for 14 days from the tickets first use unless you add the No Expiration option. I know, so many options and choices! Plan out your days, see what options you plan to use, and plan your ticket purchase from their. If you need help choosing a ticket type, just let us know and we can help you decide. Read more about tickets
HERE. Hope this helps as you plan your magical vacation!