Find a large container with a lid, such a 3.5 liter Cambro food container. Pour in 3 quarts of cold distilled water.
Warm up the coffee beans in the microwave for 10-15 seconds to release oils and flavors of the beans. Roughly ground beans in grinder or food processor. Pour grounds into water and stir until the grounds are soaked and distributed. (It is best not to finely grind the beans because it will more difficult and time-consuming to filter later.)
Cover with lid and let sit at room temperature for 24 hours.
Strain out the coffee grounds. Start with a mesh strainer to get rid of larger pieces. Then, proceed using coffee filters set over the strainer to clean the rest of the coffee.
Store coffee in fridge until ready to use. If you’d like, make frozen coffee cubes in ice cube tray.