Homemade wine: After the ripe red grapes are washed with clear water, the stalks, green grains, moldy grains, broken grains, etc. are removed, and put into a sterilized and air-dried container (it is best not to use copper, iron and aluminum plastic containers for glass barrels or porcelain jars), and crushed or mashed by hand.

However, before operation, hands, sticks, containers, etc. must be washed once with potassium permanganate, then washed once with clear water, and then operated, so as to prevent contamination by miscellaneous bacteria. At the same time, care should be taken not to use tools and containers made of metal such as iron and copper (or disinfect them in cups with clean aluminum spoons) to mash grapes.