Hi Tejay,
Yes! I am not sure if you are asking if you can bring your own food to your resort or the parks but the answer, to an extant, is yes to both questions.
You are welcome to bring you own food to your resort room and most resorts have a refrigerator in the room, if not one can be rented for a minimal fee. The Vacation Club Villas and the Fort Wilderness Cabins also have small kitchenette areas with refrigerators, stoves and microwaves. We often carry in snacks, milk, breakfast food and more for light meals in our room. You are also able to have groceries delivered to your resort at the time of check-in. My favorite location for that is www.gardengrocer.com.
Now on to the parks, you are able to carry small coolers and backpacks into the parks, just be aware that any bag will need to be checked by security. You can carry in sandwiches, chips, snacks, juice, water and other items that can be transported in your bag or small cooler. Generally if your cooler is smaller than 24" x 15" x 18" you should be fine. Soft sided coolers are typically perfect. You can find information on what coolers are allowed into the parks
here.
So feel free to carry and eat away, you are covered!