Add 3 of the strawberries, the sugar, and the basil leaf to a cocktail shaker and muddle well. Add ice to fill the shaker halfway, then add the Strawberry Basil Infused Vodka, 1 slice of lemon, and the lemonade. Put the lid on the shaker and shake vigorously for 30 seconds to 1 minute, or until the shaker feels very cold. Strain the Boozy Strawberry Basil Lemonade into a martini or cocktail glass and add a splash of plain seltzer water. Garnish with the remaining slice of lemon and strawberry and a sprig or leaf of fresh basil.