In this case, it's good to focus on prevention rather than treatment. Herbal teas won't necessarily fight off the flu, but they can strengthen your body and immune health so that you don't fall sick in the first place. Whether you prefer a cup of tea, a smoothie, or an old-fashioned glass of juice, there's something for everyone. Let's take a look at a few easy, natural drinks you can make at home to boost your immune system.