First, you need to gather your ingredients together, then begin the following instructions.
Add 2-3 teaspoons of water to a shaker or a glass jar with a tight-fitting lid. Make sure your water is cold, not warm. Add your instant coffee and sugar if you choose to use them to the jar as well.
Close the lid tightly and shake for 10 seconds, or until the mixture turns into foam.
Pour your foam into a glass, add the remaining water, some milk if you wish, and three to five ice cubes. Stir until blended.