If you enjoy a rimmed glass, prep the rim by rubbing an orange or lime wedge along the rim. Pour sugar or Truvia (for fewer calories) onto a plate or salt rimmer. Dip the glass in the sugar and set aside.
Make the marg:
Fill a cocktail shaker with ice and add the cranberry juice, tequila, triple sec or Cointreau, and orange juice to the shaker. Shake vigorously until the sides are fully frosted.
Serve:
Fill a lowball glass with ice. Strain the margarita into the glass and top with sparkling water or Topoco chico.
Garnish with an orange slice and enjoy.
Notes
Make it a pitcher, yielding 8 servings, by adding 2 cups of cranberry juice, 1 cup of tequila, ½ cup Cointreau or triple sec, and ¼ cup orange juice into a pitcher. Add a handful of ice and refrigerate for 1 hour. Pour about ½ cup of the pre-mixed cocktail over ice and top with sparkling water or Topo Chico.