Coarsely grind the coffee beans in your grinder, using short, quick pulses. You want a coarse grind the beans, finely ground beans will produce a cloudy cold brew.
Add the coffee grounds to whatever large jar, pitcher or container you are using. Pour the filtered water over the coffee grounds, and stir well with a long-handled spoon to thoroughly saturate the grounds.
Cover the jar to protect it from dust, dirt, bugs, using a lid or cheesecloth.
Let steep for at least 12 hours, I find 16-24 hours to yield the best results.
Filter the coffee by setting up a strainer/fine mesh sieve with cheesecloth, four sack towel or cotton nut milk bag. Pour the cold brew through, pressing down on or squeezing the grounds.
Store the cold brew coffee in whatever container you'd like. Cover and place into the fridge.
Store for up to two weeks.
Serve the coffee over ice, diluting it as much as you'd like with water, milk, nut milk, etc.