There are many health benefits to increasing your fluid intake while dealing with a cold and cough. Viral infections cause the common cold, and these types of infections normally increase mucus production. Blowing your nose quickly expels mucus from the chest and nasal passageway. In turn, your body loses fluids. Drink water and juices to replace lost fluids. This will flush toxins from your body and keep your body hydrated. Orange juice encourages the expulsion of mucus, which can reduce chest congestion. And drinking hot teas or other hot liquids can soothe a scratchy throat and ease a chronic cough.