In your glass of choice, add ice and 1 can of sparkling water. Then take half of a lemon and squeeze the juice into your glass, stir gently. Grab your liquid stevia of choice and add a few drops, adjust for your level of preferred sweetness. Stir to combine. Once combined, add fresh blueberries, blackberries, lemon slices (if desired), and fresh rosemary sprigs. Give one final stir and enjoy!