MK: Main st Bakery/ Columbia Harbor House
Epcot: Sunshine Seasons/Cantina de San Angel
DHS: (nothing really) ABC Commisary
AK: Flame Tree Barbeque
DD: Wolfgang Puck Express/ Goofy's Candy Co.
rather than be limited to the parks, don't forget there is take out from Captain Cooks at the Poly if this is en route to a park with marginal offerings...