Maybe the old solar still might come to save the day in this situation. However, I'd imagine that anything you could use to roof over the still, and anything you could use to collect the water that is distilled, could also be used to hold the water for boiling.

If I were in this situation, and were in dire life-and-death need of drinking water, I'd just drink it. I'd look forthe clearest water I could find, in a pond surrounded by green vegetation, strain it through a piece of cloth to remove particulate matter, and drink it. It's not a foolproof, or even all that reliable, a system, but you might get lucky, and that probability is increased by the above steps. Even in the worst-case scenario you'd likely have at least 12 hours before any serious symptoms set in.

Then when I get back to civilization I'd have a doctor hook me up with broad-spectrum antibiotics.

The assumption here is that you will be rescued within a matter of hours, perhaps a day at most.

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.

So if it's come down to life-and-death, drink up, whatever you can find.