The brewed coffee can be refrigerated in the refrigerator. This is called cold brewed coffee, which is different from ordinary iced coffee. Self-cooling coffee making material: 500g coffee powder glass sealed jar (3L) 1 piece of water 2L coffee filter cloth 1. Practice: prepare a clean sealed jar, add half coffee powder and half water, gently shake the bottle and let it stand for 5 minutes without stirring. Add the remaining coffee powder and water, gently stir well, cover and refrigerate for 48 hours. Prepare a large bowl, put a coffee filter cloth on it, and filter the brewed coffee twice until there is no coffee grounds. Pour the coffee into a sealed jar and put it in the refrigerator.