In a cocktail shaker, add 2 tablespoons of water, the instant coffee, and sugar (if using). Cover and shake vigorously for 30 seconds.
Add 1 cup of ice cubes to the shaker. Cover and shake again for 30 seconds. Pour the foam and ice into your Protecting Friends jar.
Add more water, ice, and milk as desired. Pop in a paper straw, and serve right away.