5. Green Tea
Green tea is a great source of antioxidants and other ingredients that can boost the immune system and help it to fight infections. Supporting the immune system is generally always a good idea, as it this is what will ultimately drive out infections and improve your health.
Make sure that you do this in any way possible. Drink juice, take a multi-vitamin and generally fortify yourself with the right diet just as you would do if you had a cold of a flu!