We did the DxDDP for 6 nights in May for 2 adults and 1 5yo child. I can give you what we spent money on. It came in pretty close to budget.
Misc Food/Drinks/OOP meals $150
This included $100 for alcoholic beverages for the 7 days/6 nights, plus 25 for our meal in the airport on arrival day, plus another 25 for our meal in the airport on departure day. I had originally budgeted an additional $50 for miscellaneous beverages in the parks, but we used our snack credits. And we had 19 snack credits left the last day...big stop at the candy store/bakery on Main Street!
Shopping/souvenirs $500
This is personal, we didn't spend that much, but it was good to have it budgeted.
Dining Tips $250
This was right on the money.
Misc. Tips $50
Let's see, this was:
$5 to the airport porter when we left our hometown
$5 to the shuttle driver from the remote parking to the airport in our hometown
$5 to the Magical Express driver on our way to our resort
$25 to Mousekeeping at the Wilderness Lodge
$5 to the Magical Express Driver on our way from the WL to MCO
$5 to the shuttle driver from the airport to remote parking in our hometown
Bibbidi Bobbidi Boutique: $75
$55 for the package/tax
$20 tip
Babysitting $50
Our DD spent a couple of hours at the Cub's Den at the WL while we went to a fancy-shmancy dinner.
The only other expenses I didn't list here that were in addition to our airfare and Disney package were prepaid: $100 for PhotoPass and $80 for remote parking at the airport in our hometown. Oh, and don't forget luggage fees by your airline going and coming.
HTH! Have a great time!