Clear broths like miso, chicken or veggie broth, and beef bouillon will keep you hydrated and are easy to digest if you don't have much of an appetite. If you are feeling hungry, soups that contain chunks of veggies, whole grains like barley, and some kind of lean protein will also offer added vitamins and nutrients. The hot liquids do double duty by warming the body from chills and also opening up sinus passages to relieve congestion.