Stir together pisco, pineapple juice, coconut water, lime juice, simple syrup and bitters.
In a shaker add a third of the previous mixture, an egg white and a pinch of salt; shake until it is all mixed up. Add the ice and shake until it is almost frozen. Strain and pour the mixture into two small cocktail glasses. Garnish each cup with a piece of pineapple. Serve right away. Repeat the previous instructions to make 4 more cocktails.