Hi Roger,
Disney's Quick Service Dining Plan costs $29.99 per person per night, Children 3-9 $8.99 per person per night. Please note these prices are subject to change. For this price you get 2 Quick Service meals and 2 snacks per night plus a refillable mug to be used at your resort for the length of your stay. A list of participating restaurants can be found
HERE.
Some of my favourite places to use Quick Service credits are.....
Magic Kingdom - Columbia Harbour House, their sandwiches are yummy.
Epcot - Sunshine Seasons has a huge variety of different foods to choose from.
Animal Kingdom - I love the chicken caeser salad in Pizzafari, they do sell pizzas too :)
The resorts often have good options, including healthy alternatives!
Have a great trip,
Jo