This depends on so many factors and where your staying, do you have a car etc.
A <b>cheap</b>, good quality days food example.
Breakfast All you Can eat buffet at Sizzler, Ponderosa, or Golden Corral approx.$6
This should fill you up for the day or at least you'll only need a light lunch/snack at the parks ( take it in with you and water
).
Dinner All you Can eat buffet at Sizzler, Ponderosa, or Golden Corral approx.$11
Full steak or chicken dinner and all you can eat buffet with fruit, salads, main courses, and deserts. You'll come out stuffed full
Prices are per person and include free refil soda's.
Kids are cheaper, under 5s normally free
Prices go up from the above and can get costly if you eat on Disney property a lot.
The one thing Orlando is not short of is restaurants theres something for everyone and every budget.