In a large jug, mix together
Ground Coffee (2 cups)
Water (3 1/2 cups)
. Cover with plastic wrap and let sit at room temperature for 12 hours.
Place a paper coffee strainer in a regular metal strainer, and gently pour the coffee water through both into a large bowl or jug. You don't want any bits getting through, so pour the coffee a little at a time. You will end up with about 2 cups of coffee concentrate.
Serve in a glass half filled with the concentrate, half filled with either
Milk (to taste)
Water (to taste)