Here is a collection of videos all about cleaning water so you can drink it. This skill could save your life!
Primitive technology with survival skills build a water filter tank part 3
How To Turn Salt Water Into Fresh Water (Simple Improvised Distillation)
How Seawater Desalination Works
How to Make Charcoal Water Purifier at Home - Science Project For poor & Remote Area
Primitive Technology: Filter Dirty Water