2 3/4 cups white cranberry juice, chilled
1/4 cup fresh lime juice (or lemon juice), chilled
1 1/2 cups white rum, chilled
1 tablespoon grenadine syrup, chilled
Simple syrup to taste (about 1/8 cup), chilled
3 cups club soda, chilled
Ice
In a large pitcher, mix all the ingredients except the club soda and ice. Stir well to combine. Mix in the club soda, and serve over ice.