Welcome to planDisney, Bridgette! I'm so glad that I get to answer a question from a fellow Texan today. People from Texas have a long list of unique things that we love and somewhere near the top of that list is Dr. Pepper. Between you and me, we both know that the best stuff comes from Dublin, Texas but let's chat about what kind of soda and soft drinks you can find at The Most Magical Place On Earth.
Bridgette, I'm a Dr. Pepper drinker too and I have never seen it at Walt Disney World Resort in either the regular or diet flavors. If you're staying at a
Resort Hotel that has a Coca-Cola Freestyle machine you'll be able to get Pibb Xtra, which is pretty close to the flavor you're looking for. If you can't start your day without a Diet Dr. Pepper, I recommend
placing an order with a grocery delivery service that can bring a case to your Resort Hotel. There are also grocery stores and big box stores close enough to drive to if you have a car with you, or you can hop in a rideshare vehicle to take you there!
I hope this answers your question, Bridgette, and please let us know if there's anything else we can do to help you plan your magical vacation!
Jessica