Hi Malcolm and welcome to the Disney Parks Moms Panel.
You can absolutely bring your own food and drink into all of the Disney Theme Parks and Water Parks.
Not only is this a great way to save money, it is also a great way to keep children entertained whilst waiting in line at attractions. My family always bring an assortment of dried fruit, granola bars, potato chips and bottles of water with us when visiting the Disney Parks.
The only food and drink related prohibited items as outlined in the
Park Rules and Regulations are:-
Alcoholic beverages
Glass containers (excluding small containers such as baby food jars)
Suitcases, coolers or backpacks, with or without wheels, larger than 24" long x 15" wide x 18" high
Please also note that plastic straws are not permitted in
Disney's Animal Kingdom Theme Park for the safety of the animals.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma