Hi Anna! Welcome to the Disney Parks Moms Panel.
You must be getting very excited for your upcoming Walt Disney World Resort vacation! You will be vacationing at a wonderful time of year. There are so many wonderful seasonal happenings it is hard to choose where to start. With a two week getaway I hope that you will have plenty of time to enjoy everything! Our favorite holiday happening is the
Candlelight Processional in Epcot.
It is true that there are limited grocery buying options, especially when you are looking for more specialty items such as a specific brand of an item. I have not seen Diet RockStar Energy drinks and when I called today the Cast Member that I spoke with also said that they were not aware of this being sold.
We have always been able to purchase the essentials at the Disney Resort hotel food courts such as a half gallon of milk, juice, etc. Whenever I am staying for an extended period of time I use a grocery delivery service called Garden Grocer. They have been absolutely wonderful each time I have used them. They will deliver your grocery order right to your Resort hotel, and Bell Services will hold your groceries until you arrive. They will even keep your perishables cold!
I hope that you have a wonderful vacation. Please come back and visit us soon!
~Heather~