Probably something analogous to the 5 second rule: if it doesn't touch the ground, it's fine. Water falling from the sky, even if you store it in clean rain ba

Probably something analogous to the 5 second rule: if it doesn't touch the ground, it's fine. Water falling from the sky, even if you store it in clean rain barrels, still contains impurities and pollutants that the rain passes through. https://www.cdc.gov/healthywater/drinking/private/rainwater-collection.html https://www.cdc.gov/healthywater/drinking/private/rainwater-...