It depends on the cause of your dry cough. A dry cough is often associated with a problem in the neck or head area. It may be due to allergies and drainage down the throat from the nose. It can also be due to irritating substances in the environment. Some medications can dry the mouth and lead to dry cough also. Drinking plenty of water and clear liquids is a good starting point. If the cough continues and you have known allergies, then taking an antihistamine can help to suppress the cough. If you notice the cough gets worse while you are outside, then you may want to consider wearing a simple hospital mask to decrease exposure to outside irritants.