I am a drop of water. I am pure and clean, and I come from heaven. I have been shaken

I am a drop of water. I am pure and clean, and I come from heaven. I have been shaken from the clouds, and have come to earth to help you. I am very small, but I can do a little. I can wash your hands and face; I can cleanse your teeth, and make your breath pure; I can help to cook your food, and to digest it; I can make your body clean and healthy, so that your bones can become