Possible Clues:

• Mr. of soft drinks
• Mr. -- (soft drink)
• Soft drink ___ Xtra
• ___ Xtra (Coca-Cola Company beverage)
• ___ Xtra (soft drink brand)
• Mr. -- (soft drink name)
• Soft drink that used to be a Mr.
• __ Xtra: Dr Pepper rival
• ___ Xtra (Coca-Cola subbrand)
• Mr. ___ (soft drink)