How do separate red cabbage from cabbage water?

Yes you can.

it is because red cabbage has a bitter taste,but the geen cabbage does not have the bitter taste.

Magic. The two are not convertible. The two colors are two different varieties of cabbage. If you want red cabbage grow it direct from seed or buy it pickled.

Red cabbage is one of many varieties of cabbage grown in temperate regions worldwide. Its juice contains the pigment cyanidin, which is used as a homemade indicator of acids and alkalies because it...