Wash the blueberries: Rinse the blueberries under cold water and remove any damaged berries.
Create the blueberry base: Add blueberries to a blender and blend until smooth. If you prefer a more natural texture, lightly crush the berries instead.
Add fresh lemon juice: Squeeze the lemons and mix the juice with the blueberry puree. Stir well to combine the flavors.
Sweeten the mixture: Add sugar, honey, or another sweetener. Adjust the sweetness according to your preference.
Add chilled water: Pour in sparkling water or cold water and gently stir until everything is fully mixed.
Serve over ice: Fill serving glasses with ice cubes, pour in the blueberry lemon mixture, and decorate with lemon slices or mint leaves.
Enjoy fresh: Serve immediately for the best flavor and refreshing taste.