Welllllllll....if the traffic jam is bad enough, you could dig a solar still with the lid from your Altoids tin PSK on the side of the road, stretch some of the plastic from your garbage bag shelter over the hole and then enjoy the results with your Teflon sipping tube.
But come to think of it, if the traffic jam is THAT bad, perhaps you'd better just end it all with your single-edged razor blade ... just kidding ... sort of ...