Water helps the body to process and flush out toxins faster, which makes it a quick and easy natural method that will make your hair grow a lot faster. If you drink about 8 cups of water a day, not only will your body feel better, but your hair will get stronger. The stronger the hair, the faster that it grows. Drinking water also keeps your hair hydrated from the inside out. Hydrated hair is happy hair because, when dry, your hair is much more likely to break.