Add coffee and water to a large glass container.

Shake or stir together to combine.

Allow to brew for 12 hours at room temperature.

Using a mesh strainer and a funnel, pour coffee into another large container. [Glass, preferably.] If desired, you can also place a coffee filter in the mesh strainer to further filter the coffee. We've tried it with and without, and haven't noticed much of a difference. Using a filter takes much longer.

After you've filtered the coffee, you have two options: heat it over a stove or drink it iced. Either way, mix 4 ounces of coffee and 4 ounces of water per serving.