Barbados Rum Punch (Bajan)

Name: Barbados Rum Punch (Bajan)
Prep time: 10 min
Total time: 10 min
Cuisine: Caribbean
Ingredients: 2 cups water; 1 1/2 cups Barbados dark rum; 1 cup simple syrup (preferably homemade); 1/2 cup freshly squeezed lime juice; 8 dashes bitters; Freshly grated nutmeg