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Why not make your own natural water filter that can be used in the wild to teach your students about filtering water? It's a great resource for stormwater pollution education!
Purification and filtration in [ONE PRESS]. The GRAYL Ultralight makes safe, clean purified drinking water – anywhere in the world!
The LIFESAVER bottle - instant water purification, no chemicals used
Berkey Water Filter Review + Important Tips
Disaster Strikes Unexpectedly. Here's How to Purify Water in Case of Emergency. Learn More about How the Second Harvest Community Food Bank Assists Those in Crisis
Water Purification Solar Still Learn how to survive any situation at dansdepot.com
How to Make a Solar Water Distiller to Purify Water
diy Filter rain water in a barrel (or other container), with sand, charcoal etc)
LifeStraw Personal Water Filter