Hi, Georgina, If you are not planning on many table service restaurants for your dining while at Disney, the Quick Service Dining Plan might work out well for you. The cost is $29.99 per night for adults, and $8.99 per night for children ages 3 - 9. (prices subject to change.) This includes (per day) 2 Quick Service meals, 2 Snacks, and 1 refillable mug for your stay.
If you want to add this, or any Disney Dining Package, to your resort reservation, you need to do so at least 2 days prior to your check-in. You also need to have at least a one day base ticket on your room reservation. For details on the Quick Service Dining Package, click
HERE.
Have fun on your May Vacation in Disney World!