There are no restrictions about the type of food
you can bring to the park with you. You are welcome to bring a full meal with you -- sandwiches, fruit, snacks, beverages, etc. You should be aware of that alcoholic beverages may not be brought into the parks. Nor are glass containers, other than baby food jars, are allowed.
While you can bring any food you want to WDW, there are some restrictions about how you transport food into the parks. Large coolers and wheeled coolers are not permitted. If you click
here,
you'll find a list of Frequently Asked Disney parks questions. At the
bottom of the list, you'll see the maximum dimensions of coolers
allowed in the parks. As long as you stay within
these guidelines, you can enjoy your own food in the theme parks.
Happy touring!