Rain is created using the natural equivalent of distilling water, but it is also influenced by other factors.
As rainwater travels through the atmosphere, it absorbs pollutants and other contaminants. When it lands on your roof or in your gutter, it collects bacteria and other impurities that are present.
You must take additional steps to clean your collected rainwater and ensure it is safe to drink. You can do this by either boiling it, filtering it, or treating it with chemicals such as chlorine or iodine.