It's easy to imagine a scenario where it might be necessary to provide one's own filtered water. Should that set of extreme circumstances ensue - or perhaps on a camping trip - here are some ideas that should see you through:

Homemade Emergency Water Filter Kit by IntenseAngler


Home Made Water Filter by Colhane


How to Drink Dirty Water in Emergency Situation - Survival !! by HadronMesons - Science and Tech


How To Make A Water Filter With a Bottle by THE DAILY PREP


Homemade Gravity Fed Water Filter by sunfloweroutdoor


Homemade Water Filter Setup by NCHiker1970