Welcome to planDisney, Daniela! I'm so glad to be able to answer your question today.
Snacking and dining are my favorite things to do at Walt Disney World Resort, but if you want to have your own familiar snacks and drinks in your backpack while you're at the Theme Parks, you're certainly allowed to do that. Outside food and drinks are perfectly fine, so go ahead and bring your favorites with you! The only thing to keep in mind is that no outside alcoholic drinks are allowed, and anything packaged in a glass bottle or container is prohibited. Other than that, feel free to pack a snack!
If you do find yourself in the mood for a special Disney snack, I have a few favorites to recommend! The one snack I always get is the Cheeseburger Spring Rolls from the cart just outside the Adventureland entrance at
Magic Kingdom Park. I'm also a huge fan of Cold Brew Black Caf from
Kat Saka's Kettle in
Star Wars Galaxy's Edge, and French Fries with Pulled Pork and Cheese from
Flame Tree Barbecue in
Disney's Animal Kingdom. There are also classic snacks like Mickey Pretzels, freshly-popped popcorn, and hand-scooped ice cream at all of the Theme Parks, so be sure to save some room for something Mickey-shaped!
Have a magical day, Daniela!
Jessica