The Hario Mizudashi Cold Brew Coffee Maker is the easiest way to enjoy cold brew coffee at home from Hario; simply fill in the filter cone with your favourite coffee, add room temperature spring water into the pot and stir the top grounds to let the coffee soak into the water fully. Once the coffee grounds are wet, store the cold brew pot in the refrigerator and leave it for at least 8 hours. Then, take the mesh filter out and drain it.