To make the Basil Syrup, combine the water and sugar in a sauce pot. Bring to asimmer over medium-high heat.
Whenthe sugar dissolves, remove from the heat, add the basil, cover and let the basil steep for 10 minutes.
Let the syrup cool completely before using. Store,covered, in the refrigerator for up to 6 months.
Add the blueberries to the large cup of the CocktailShaker and crush them using the Muddler.
Add the syrup, juice, and 1 cup (250 mL) of the ice to the large cup, seal the shaker and shake vigorously
Add the blueberries to a large pitcher and crush them using the Muddler. Add the syrup and juice; stir to combine.
Whenready to serve, add up to 12 oz. (350 mL) of the mixture to the large cup of the Cocktail Shaker.
Add the ice to the large cup, seal the shaker, and shake vigorously.
Use the Cocktail Strainer to strain into a chilled glass filled with ice. Top with the sparkling water and garnish with a limewedge and a sprig of basil.