Place strawberries, basil, & sugar in the bottom of a cocktail or other small pitcher.
Muddle lightly using muddle stick or a wooden spoon. Strawberries don't have to be completely crushed, just smashed enough to make mixture nice and juicy. Add rum, juice, & wine & stir gently. Use immediately or refrigerate up to 1 day.
If you have any extra strawberries or basil, make a pretty garnish by cutting a slit in the strawberry and carefully placing a basil leaf in the slit. "It just gives it a little something extra, dontcha think?" ;-) (Bonus points if you can name the movie that quote is from.)
To serve, fill cup with ice. Pour in sangria, leaving about an inch at the top. Add splash of sparkling water & garnish.