Expect tart fruit flavors, candy-inspired combinations, and plenty of color.Credit: Food & Wine / Dunkin' / Getty ImagesKey pointsDunkin’ is expanding its 2026 Halloween menu with Green Apple Dunkin’ Zero, a new zero-sugar energy drink with a crisp, tart apple flavor.The Halloween lineup includes 12 new drinks featuring seasonal flavors like green apple, blackberry, blueberry, tiramisu, and toasted almond.Purple Marshmallow Cold Foam adds a Hall…