https://www.sierraclub.org/sierra/how-treat-backcountry-water-cheap
That is the simple and clear guide.
I’m talking about bleach. Safe, lightweight, and cheap, it’s been my go-to water-treatment system for years. Here’s how I do it: I buy plain (unscented) bleach for $1 from the grocery store and put it in something like a $0.50 plastic dropper. When my water bottle is empty, I fill it in a stream, add two drops of bleach per liter of water, then let it sit for 30 minutes. That’s it.
Two drops per liter (or eight drops per gallon) is the amount recommended by the Environmental Protection Agency and the Centers for Disease Control and Prevention. The CDC calls disinfection with chlorine a “pathogen reduction method”—meaning it significantly reduces the risk of water-borne pathogens but doesn’t completely eliminate it. However, the CDC refers to most water filters the same way. Filters are highly effective at killing Giardia but often less great at getting rid of viruses, for instance, while bleach is highly effective at killing viruses but less effective when it comes to Giardia.
“If one is going to be drinking water in areas where protozoa may be an issue, I would recommend an alternative method,” says Aaron Reilly, an assistant professor at the University of New Mexico who specializes in wilderness medicine.
For a similar discussion see: https://www.outsideonline.com/2412373/drinking-diluted-bleach-purifying-water
For something similar, but better:
“Calcium Hypochlorite is widely available for use as swimming pool chlorine tablets or white powder that is much more stable than chlorine. This is often known as “pool shock”.”
Copyright © SurvivalTopics.com Read more at: http://survivaltopics.com/better-than-bleach-use-calcium-hypochlorite-to-disinfect-water/
Or, you can buy water purification tabs.
Me? I carry purification pills and tabs and a Sawyer filter.