This leads to a related question.  Assuming you're in a situation where it's your best option, what's the best way to kill yourself without tools?  I assume dying of dehydration / exposure is not particularly enjoyable, and a set of circumstances might exist where it would be better to get it over with...<p>(See below for the link to the guy that cut his arm off to avoid dying.   I don't think I would be able to make it through the bone, so I would like to have this option filed away in case I need it some day :)