Summarize:

Get pre-purchased crushed ice or crush ice yourself by grinding up ice cubes in a blender. As the ice melts, it will cut through the creaminess of the drink which makes it taste better. If you don't have a cocktail shaker, place the cubes in a tall glass instead. Carefully measure out the Amarula and coconut water in a shot glass or jigger so that you use the proper amounts. If you'd rather have a citrus cocktail, replace the coconut water with a shot of Triple Sec instead.  You can also replace the coconut water with a shot of gin if you'd rather make a martini. If you want an even stronger cocktail, put 2 shots of Amarula in the drink. Vigorously shake the shaker to mix everything together and partially melt some of the crushed ice. This infuses the Amarula with the crushed ice. If you don't have a cocktail shaker, place the top of another glass into the glass with the Amarula so that it forms a seal. Then, hold both glasses together and shake the beverage to mix it. You don't have to strain the drink because it tastes great on ice. If you used Triple Sec instead of coconut water, garnish the drink with an orange peel to finish it off.
Place 2.5 oz (71 g) of crushed ice of crushed ice into a cocktail shaker. Pour 1 shot of Amarula and 1 shot of coconut water into the shaker. Shake the drink to incorporate all the ingredients. Pour the drink into a martini glass and enjoy.