The legal drinking/purchasing age of alcoholic beverages is 16.
Barbados has some of the purest water in the world that can be drunk straight from the tap. Cruise ship employees are often seen stocking up on their water supplies while docked at the island.
Rum and rum drinks are featured at every bar. Perhaps the most famous domestic brand offered is Mount Gay Rum, which is very delicious. Modest cost tours of the distillery (http://www.mountgay.com/) are available on weekdays. They offer samples of all their rums, also sold at attractive prices.