White sangria recipe

1/4 cup triple sec or Cointreau 1/4 cup simple syrup (or to taste) 1 cup orange juice 1 cup soda water or club soda 1 lemon, thinly sliced 1 lime, thinly sliced 1 orange, thinly sliced 1/2 cup fresh or frozen berries (such as strawberries, raspberries, or blueberries) 1 apple, cored and diced Fresh mint leaves for garnish (optional)