Related Clues:

• Bubbly buy
• Bicarbonate of ___
• Fizzy soft drink
• Pop in the mouth?
• 27-Across, e.g.
• Concession stand purchase
• Soda brand
• Vodka mixer
• The older it gets, the flatter it gets
• Ballpark beverage
• Part of many a drink order
• 'Obey your thirst' sloganeer, once
• Kind of a jerk?
• Puck, for one
• See 44 Down