Add the granulated sugar, LMNT Raspberry Salt Electrolyte Drink Mix, basil leaves, lime, blackberries, and bourbon to a cocktail shaker. Muddle the ingredients to break up the blackberries and lime and to dissolve the sugar and electrolyte mix.
Add ice into the cocktail shaker and shake until chilled. Fill two glasses with ice. Divide the cocktail between the two glasses. Top each glass with club soda. Garnish with additional blackberries, sliced lime, and mint. Enjoy!