Hot soak the coffee bag in your favorite mug (volume above 300ml) and add the whole hot water of about 250c.c, soak for 6 minutes to shake the coffee bag slightly and then take it out.
Put the coffee bag in a wide-mouth bottle (above 300ml volume) and add 250c.c water at room temperature. After sealing the bottle, shake it for about 10 times and place it in the refrigerator for about 24 hours. Take out the coffee bag before drinking.
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