7
votes
1answer
105 views

Water filters - why sand and rocks?

Saw a video on youtube where some guy made a water filter out of a bottle, charcoal, sand and little rocks. He commented that since the charcoal is very porous it's great for filtering. Then, after ...
5
votes
3answers
147 views

When to perform a filtering of the water?

Let's imagine I'm hiking and I find a water source - like a lake, a stream or a well, and I want to fill my water bottle with it. I have a bottle and a water filter. And a bandana. Since I can't ...
5
votes
2answers
196 views

Is cold shock response a real danger, if someone is used to cold water?

Various sources (mostly TV stations, at least in my region) are constantly warning about the danger of cold shock response, if someone goes to water too quickly. But on the other hand, Bear Grylls ...
7
votes
2answers
381 views

What backwoods trick to get pure water produces the most safe water?

So I read this answer and I was wondering what contraption produce the most water when you don't have a water source? So what water trap produces the most water? Specifically, what should I do with my ...
6
votes
1answer
100 views

Finding water in the dry wilderness

If I'm in the wilderness in a dry, hot climate without much vegetation and I'm running low on water, what land features and other potential signs can I look for to guide me to a drinkable water ...
14
votes
2answers
336 views

Where are good places to look for water sources when I have run out on a multi-day hike?

Luckily this has never happened to me, but even the most prepared hiker can often get themselves into difficulties if they run out of water. My question here is in your experience in remote arid ...
8
votes
2answers
2k 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?
34
votes
3answers
17k 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?