The listing of 'Gin' as a required tool is a typo; you will not need it. Essential tools include a highball glass, a jigger for accurately measuring the rum, and a paring knife or peeler for preparing the lime garnish. A bar spoon is optional for a gentle stir, but not strictly necessary.

While a true 'Dark 'n' Stormy' legally requires Gosling's Black Seal rum and Gosling's Stormy Ginger Beer for authenticity, you can experiment with other dark rums and robust ginger beers. Be aware that changing these core ingredients will significantly alter the traditional flavor profile and may not be considered an authentic 'Dark 'n' Stormy'.

Angostura bitters add aromatic complexity, a hint of spice, and a slightly bitter counterpoint that beautifully balances the sweetness of the ginger beer and the richness of the rum. They elevate the drink by introducing an extra layer of flavor and depth not found in the classic two-ingredient version.

A common mistake is using too much bitters, which can easily overpower the drink; stick to two dashes for balance. Another error is using ginger ale instead of strong, spicy ginger beer, which will result in a weaker, less flavorful cocktail. Always use plenty of fresh ice to avoid quick dilution.