Related Clues:

• Pepsi or Coke
• Caffeine source, often
• RC or Jolt
• Pop label
• Fountain choice
• Vending-machine offering
• Fruit juice alternative
• ___ ZERO
• Bubbly, brown potable
• Popular mixer
• Fuel derived from coal
• Dark soft drink
• One of the 9-Across
• Caffeinated drink
• Jolt, e.g.