In a large container, mix ground coffee with water. Cover and allow to sit at room temperature eight hours or overnight.
Line a fine mesh strainer with cheesecloth and set over a pitcher or other container. Pour coffee/water mixture through the strainer, allowing all liquid to run through. Discard grounds.
Place coffee liquid in the fridge and allow to cool. Use as needed.
To make iced coffee, pack a glass full of ice cubes. Fill glass 2/3 full with coffee liquid. Add milk 1/4 cup milk. Add 2-3 tablespoons sweetened condensed milk and stir to combine. Taste and adjust milk and/or sweetened condensed milk as needed.
