Rain Water Rainwater is collected from precipitation. It can be a good source of water if collected and stored properly, but it must be filtered and purified to remove potential contaminants.
Practical Advice: Collect rainwater in clean, food-grade containers and filter it before use to ensure it is free from pollutants and pathogens.
Scientific Evidence: Research shows that rainwater can be a viable water source when properly collected and treated, but it can be contaminated by airborne pollutants and debris from collection surfaces.