Drinking water can help a lot when it comes to loosening up the phlegm and is an effective method to eliminate coughing. Liquids is good, but stay away from milk. Warmer and clear type drinks are good for this.
Using a vaporizer will provide you with nice warm moist air which will help loosen the mucus and cure the disease.
Don’t smoke at all and avoid alcoholic beverages. Consuming alcohol will absorb the liquid and will reduce the water levels in your body.