For the best flavor, use freshly squeezed Valencia orange juice. If Valencia oranges are unavailable, use another high-quality orange juice, adjusting the sugar as needed. Chill all ingredients thoroughly before mixing to ensure a refreshing cocktail. Adjust the sweetness to your preference by adding more or less sugar. Taste as you go! For a festive presentation, rim the glasses with sugar before adding the cocktail. Feel free to experiment with different types of gin or vodka to find your perfect blend. Agua de Valencia is best enjoyed immediately after mixing to preserve its effervescence.