Selection and storage
Fresh grapes can be available all around the seasons. In the stores, choose those that feature plump in consistency, free from surface wrinkles with intact skin, without any cuts or cracks or leaking juice, and firmly attached to a healthy-looking green stem. Lift up the whole bunch in the air and shake gently; loose berries, if any falls off easily.
Buy exactly ripen berries; green grapes should feature slight yellowish hue; red types should be mostly pinkish-red, while purple and blue-black types should be deep and rich in color.
Since grapes tends to spoil early and ferment at room temperature, they should always be stored inside the refrigerator. Loosely wrap washed berries in a paper towel and place them in a zip pouch bag set at high relative humidity. This way, they will keep fresh inside the refrigerator for several days.