Mix ground coffee with water. If you use coffee beans, grind them in a food processor or with a coffee grinder.
Fill everything into a mason jar, close the jar and mix well again.
Place the mason jar in the refrigerator for 12-36 hours.
Remove the mason jar from the refrigerator and filter the coffee through a coffee filter, cotton cloth or other filter. You can use the remaining coffee grounds for a face peeling.
Mix Cold brewed coffee with vegetable milk and ice cubes. Add some sweetener if you like.