Hi Samira!
I hope sometime in my life I am fortunate enough to visit South Africa. I've lived the Disney dream (still living it actually), but visiting South Africa (and the African continent as a whole) would be absolutely incredible!
Unfortunately the base ticket won't get you into the water parks. The base ticket gives you access to any of the 4 major parks: Magic Kingdom, Epcot, Animal Kingdom, and Hollywood Studios.
The Water Park Fun & More Option is based on the number of days of your base ticket. So, for example, if you get a 5 day base ticket and add the Water Park Fun & More Option, you get an additional 5 visits to the following areas:
•Disney's Typhoon Lagoon water park
•Disney's Blizzard Beach water park
•DisneyQuest Indoor Interactive theme park
•ESPN Wide World of Sports Complex
•Green fees for a round of golf at Disney's Oak Trail Golf Course, a 9-hole walking course.
DisneyQuest, the Wide World of Sports, and the round of golf is where the "And More" option comes in :-)
For more details on the Water Parks, click here.
For more details on DisneyQuest (a favorite for many guests), click here.
Hope you have an unforgettable time at Disney World!