Muddle Blueberries and Basil: In a pitcher, add the fresh blueberries and basil leaves. Use a muddler or the back of a spoon to gently crush them, releasing their juices and aromas.
Add Lemon Juice and Simple Syrup: Pour in the freshly squeezed lemon juice and simple syrup. Stir to combine the ingredients well.
Incorporate Alcohol: If desired, add vodka or gin to the mixture for an extra kick. Mix well.
Top with Sparkling Water: Slowly pour in the sparkling water, stirring gently to combine without losing the fizz.
Serve: Fill glasses with ice cubes and pour the blueberry basil lemonade over the ice. Garnish with lemon slices and additional basil leaves. Enjoy your refreshing spring drink!