In order to suppress your cough, have honey. You can mix honey in lukewarm water or in your tea. Also you can have Lozenges or hard candy to get rid of cough. They are effective in case of dry cough as lozenges have zinc, vitamin C, etc in them which is good for you. Moreover, you can have soups. They will boost your immunity and will keep you hydrated. Simply do water gargling in order to prevent further infection. gargle using warm water with salt added in it. One more effective way to get rid of congestion because of cold is to take steam.