Related Clues:

• Fruit of the vine
• Coca Cola
• 7-Up it isn't
• Spears shills for it
• Britney promotes it
• Drink with fast food
• Fast-food staple
• With 13-Down, they may include taste tests
• Old 'Hits the Spot' marketer
• Coal product
• -
• Burger and fries go-with
• Pepsi competitor
• Float's base, maybe
• Bubbly mixer