What is the main mixer used in a Mojito?

The primary mixer used in a Mojito is club soda. This effervescent water adds a refreshing fizziness to the cocktail, which is a key characteristic of the drink. The blend of fresh mint, lime juice, sugar, and rum creates a vibrant flavor profile, and the club soda enhances the overall lightness and refreshment. The carbonation from the club soda helps to elevate the other flavors and gives the Mojito its signature bubbly quality, making it a popular choice, especially during warm weather or summer months.

Other mixers like cola or fruit juice might be common in different cocktails, but they would fundamentally change the taste of a Mojito. Water lacks the carbonation and flavor that club soda provides, making it insufficient as a mixer in this particular drink.