Hi, Devin! Let me start with your Water Park question . . . Yes, there will be a bus that goes from your resort directly to Blizzard Beach and Typhoon Lagoon. When busses pull up to the bus stop, they are clearly marked with their destination.
Traveling from resort to resort is a bit more complicated and more time consuming. Busses do not go from one resort to another, you will have to transfer at some point to get to your final destination. A fun resource is
www.ourlaughingplace.com Scroll to the bottom of the screen and click on Transportation Wizard. You can select different destinations, and it will calculate different routes and approximate travel times.
Try to book your resort dining in conjunction with where you day will be spent. For example, if you are going to be having breakfast at Chef Mickey's at the Contemporary, plan to go to Magic Kingdom that day so you are just a short walk or monorail ride away. If you are having dinner at Flying Fish on the Boardwalk, perhaps spend the earlier part of your day at Hollywood Studios or Epcot so you can go right from the park to the restaurant without too much transportation confusion!
If you are having a hard time figuring out a specific transportation issue, write us back or you can always check with your resort concierge for advice on how to get there! Good Luck!