The beauty of sangria is it's a make-ahead recipe. Each recipe is different, but you can combine the fruit and rum in this sangria anywhere from four hours to one day ahead of time. If you're planning to make this the day before, wait to add the basil until about four hours before serving to be sure it stays vibrantly green. The longer the basil sits in the sangria, the less fresh it looks. Wait to add the wine and club soda until you're ready to serve the drinks.