>>But the reality is, if you are so woefully unprepared (you didn't
>>bother to bring *anything* capable of storing water or even
>>acting as a water barrier, of any size, nor did you bring water
>>purification tablets, so chances are you're dreadfully
>>unprepared on other fronts as well), you probably wouldn't
>>survive much longer than that anyway.

That's not entirely fair. When the Lockheed Electra that Juliane Koepcke was a passenger on broke up in midair over the Peruvian jungle, she lost everything but the clothes on her back, and still managed to survive against incredible odds. She even lost her shoes (according to some sources, the shirt she was wearing was ripped off so even if she had some survival gear in her pockets she would have lost it.)

Yeah, if it's a simple case of "Oh jeez, I knew I shouldn't have made that left turn at Albakoiky", then yeah - you should have all this stuff. But this is a hypothetical scenario, and it is not 100 percent valid to assume you would have all your normal survival gear in an emergency.

Personally, I think that digging a depression in the ground and lining it with wet leaves would form a waterproof container, although I haven't tried it.