Hi Christina,
The Magic Your Way ticket has a base component which allows one entry into each of the four main parks for each day you purchase a ticket. In your case, you would have six entries into the four parks-Magic Kingdom, Animal Kingdom, EPCOT and Disney's Hollywood Studios.
If you want to visit a water park, you have two ticketing options. The first is to add a
Water Park Fun & More Option. This allows you entry to the two water parks, DisneyQuest, golfing and ESPN Wide World of Sports. It is one option for each day you purchase a ticket for. In your case, six day Magic Your Way ticket would mean six options. This means your ticket could provide twelve days of fun versus six. You could double up a day combining a day at the parks with an option. The choice is yours.
You could also pay for just a day at the water park of your choice which as of spring 2011 was about $46 for an guest over 9 and $40 for a guest 3-9. For a few dollars more, you could visit the water parks twice or DisneyQuest with the Water Park Fun & More Options.
I have the
link here so you can price out your options. You can also call Disney Tickets at 407-939-1289 with additional questions.
Have a magical vacation!
Beth