One convenient perk of staying at a Walt Disney World Resort is that you can save time and money on food by placing a shopping order and having it waiting for you when you arrive, thanks to services like Garden Grocer. Packing snacks and drinks will help keep hunger (and finances!) in check between any special dining experiences.
Bonus tip: If you spot something you want in one of the Disney shops but don't feel like toting it around all day, you can have it sent to your hotel free of charge. Just provide your name and Disney resort info, and your goods should arrive by the next day.