In case of severe cough, you should have plenty of water and orange juice, until the symptoms are reduced. In addition to this juice fast, you should adopt an all-fruit diet for about 2-3 days. Follow a balanced diet that includes raw or lightly cooked vegetables, fresh fruits, and whole-grain cereals. Avoid consumption of meats, pickles, condiments, processed foods, sugar, coffee, tea, soft drinks, and all products that are prepared from sugar and white flour.