Hello Graeme,
Thank you for visiting us at the Disney Parks Moms Panel, we are here to help and happy to do so.
The Disney Dining Plan is a great way for Guests to budget for an upcoming Walt Disney World vacation and gives Guests a bountiful amount of dining options and food.
As stated in the 2015 Disney Dining Plan brochure, "The Disney Dining Plan includes one (1) Quick-Service Meal,one (1) Snack and one (1) Table-Service Meal per person, per night of your package stay for everyone in the party ages three and over. The plan also includes one (1) Rapid Fill Resort refillable drink mug per person, that is valid for the length of your stay (eligible for refills at self-service beverage islands at Quick-Service locations at any Disney Resort hotel)."
Since you arrive July 2, 2015 and depart July 23, 2015, and assuming you purchased the Standard Disney Dining Plan, your family will have the following credits per Guest:
(21) Quick-Service Meals
(21) Snacks
(21) Table-Service Meals
(1) Rapid Refill Resort Mug
If I can be of any further pixie dusted assistance feel free to ask and enjoy your upcoming stay at Walt Disney World, may it be filled with many magical and memorable moments.
Amy M*o*