Questions about making the water found outdoors safe for drinking.

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49
votes
9answers
7k views

What is the safest way to purify water?

There are a number of ways to purify water, off the top of my head we have filters, iodine, and boiling. Clearly each has some advantage/disadvantage (iodine tastes terrible, boiling takes time). ...
20
votes
5answers
3k views

Do you need to purify all mountain water sources

I was just reading this question What is the safest way to purify water? Now I walk a lot in Snowdonia in North Wales and on occasion I drink from mountain streams. I've even camped next to mountain ...
47
votes
3answers
111k views

How long does water need to be boiled for to kill all bacteria / viruses?

This has come up a few times in a few other questions, but I've heard varying opinions from different people in a number of answers and comments on here - some saying that just boiling for a moment is ...
23
votes
3answers
24k views

What are the different methods to purify water?

What methods can I use to purify water? And what's the difference between those several methods (safety, duration needed, ...)?
44
votes
4answers
24k views

Is drinking urine safe?

We've all heard stories about how people saved their lives by drinking their urine. Is drinking urine safe when there are no other water sources available? Can I filter it with a water purifier?
20
votes
5answers
11k views

Can any waterborne pathogens survive boiling?

I know that boiling does little to break down chemical contaminants or heavy metals. But I'm unsure if it kills all microbial life. Are there any waterborne illness-causing viruses/bacteria/protozoa/...
20
votes
1answer
4k views

How much sea water can I safely drink?

Anyone who has played in the ocean knows getting a little sea water in your mouth and swallowing it will not kill you. Seawater contains salt. When humans drink seawater, their cells are thus ...
18
votes
4answers
676 views

Why are people so worried about Giardia?

Everyone I have ever been camping with seems to have an unwritten rule never to drink from streams no matter how clear they might seem, for fear of Giardia. I have also heard people telling about ...
25
votes
6answers
3k views

Where in the Alps is it safe to drink the water without filtering?

In some places, the Swedish Lappland for example, it's perfectly fine and even recommended to drink water directly from streams. Is it also recommended whilst hiking in the Alps, and if so is it only ...
12
votes
2answers
6k views

How do I desalinate seawater?

I know I shouldn't drink seawater (because of the salt it contains), but how can I desalinate it?
8
votes
2answers
571 views

Is it safe to put snow in water filtration?

I was wondering if it is safe to put snow in water filtration and then just wait until it melts down if the temperature is right. Of course, carefully picked, clean looking snow.