Divide it between two 1-liter glass bottles, and fill each one with 500mL cold water. Mix them and store for 16 hours (12-18h) in your fridge.
The next day, filter the mixture first through a kitchen sieve. Filter it a second time through a very thin sieve. I used the barista coffee maker from Tchibo for the second filtration, who comes with a very thin sieve.
The cold brew coffee is best when enjoyed fresh, but you can store it up to one week in a glass bottle in your fridge.
The coffee is very intense, therefore dilute it 1:1 with water, milk, or ice before serving.
Let the coffee grounds dry and use them as a natural fertilizer for your plants.