There are instances where packages will be cheaper if brought through an airline's website. I saw this last year when a poster asked if they had a good price that they found through an airline's website. The reason being because airlines will sometimes discount their airfare when purchased with a package. Sometimes, these airline packages will include the hotel discounts normally available only by booking separately, such as the Super Saver Rate.
My advice is to price everything separately: Airline tickets, park tickets (check both AAA and Universal's website), hotel rate (AAA and Super Saver; call to get the best rates) and transportation. Then check the prices of the various packages to compare.
As for meals, as the previous posters mentioned, there is a dining plan but it only incorporates counter service. Soft drinks aren't included in the basic dining plan, but a soft drink plan can be added to the basic plan. My advice is to skip the dining plan because there a many great restaurants you would have to skip, such as Mythos at IOA and Finnegan's at USF. And be sure to have your AAA card with you as AAA discounts are available at many restaurants and stores in both parks as well as at Citywalk.