Add the blueberries, mint leaves, lime juice, and simple syrup to a sturdy glass or cocktail shaker.
Gently muddle until the blueberries burst and the mint smells fresh. Don’t crush the mint too hard, or it may taste bitter.
Divide the muddled mixture between two serving glasses.
Fill each glass with ice.
Top with sparkling water, club soda, Sprite, or Schweppes club soda.
Stir gently from the bottom to mix the blueberry flavor through the drink.
Garnish with extra blueberries, a lime wheel, and a fresh mint sprig.
Serve the Blueberry Mojito Mocktail right away while cold and fizzy.