In general, about 6 ounces of water per 2 tablespoons of ground coffee make an average cup. Many carafes or water reservoirs in the machines have cup line indicators. If your machine has a feature to make your coffee stronger, the machine will add less water per 2 tablespoons of coffee. If your machine doesn’t have this feature, you can add more or less water to make the coffee weaker or stronger as you prefer.