Pour coffee grinds into a large bowl or container. Add the water and cover. Let rest on the counter for 24 hours.
Line a fine mesh strainer with a coffee filter (see video for example) and then gently pour the coffee and the grinds over the filter. You will need to do this slowly and work in batches. Allow yourself 30-40 minutes to strain out all of the grinds.
Store youre coffee concentrate in the refrigerator for up to two weeks.
Then the next time you want to make some iced coffee, simply fill up a glass with ice, pour your coffee about half way up and then add your favorite milk or cream. Enjoy!
*note: if you like a milder coffee flavor, you can dilute the concentrate with a little water before adding in your milk.