Firstly, regardless of the cause of the mass extinction you are going to need the big three: Food and water, shelter, and defense. Remember to keep an eye out for renewable food an water when scavenging, since a sure thing prairie dog hunt beats a single gourmet meal in the long run.
One clever way to recycle urine into a small scale renewable water source is accomplished in any warm or hot climate. Gather some plastic sheeting (a trash bag will do, the darker colored, the better!) and a small cup or can to gather the payload. Simply dig a hole, piss in it and place the can in the dead center of the hole. By stretching the plastic over the hole and placing a small stone in the center you can guide the resulting condensation to an apex, causing the pure water to drip into the container. Don't be shy, after all, Gandhi drank his own urine everyday!
|Strain through cheesecloth after boiling|
|Preparedness can be sexy!|