Pirates drank rum, right? Well, not so much- people usually mixed rum with other things back then, because the rum was very strong and not very tasty. (Still is, in my opinion.) But surely they drank grog, you might say if you know your pirate lore. Grog was a sailor's drink made by mixing rum with either water or beer. Merely watering down your rum does not do much to improve the flavor, so lemon or lime juice was sometimes added.