On our 2 trips with
DDP we spent almost NO additional money(at the time tips were included)
Things we did:
--got all of our Disney themed items at home. We made tshirts, bought them at the Salvation Army and garage sales and got a few on clearance at the
Disney Store--we had Disney tshirts for every day of the trip and it put us in the mood.
--bought cheap glo sticks an battery operated light up toys at home.
--brought a suitcase of breakfast items with us to supplement our credits and since we were staying value we also brought a coffee pot, coffee, sugar, creamer AND the disposable coffee cups that come with lids.
--bought our autograph books and trading pins/lanyards on the cheap at home
--remembered the all important ponchos
--share some counter service meals
--got free ice water at the park as needed--did not want to haul around bottles