Survival tip #1

So, every so often, not on any particular schedule, I will be posting an alpacalyptic survival tip. My apologies if these aren't very funny, that's not the point, the point is that you don't die of dysentery.
The most important thing in any survival situation, is to have a reliable source of clean drinking water. Even in a an area with standing water, drinking the standing water, or even stream water, can cause all sorts of diseases. Therefore, other collection methods are preferable. Collection method method #1, in my opinion, should be plant transpiration. This is the most important to learn because it works virtually anywhere, with the exception of places like the Erg and Mongolia.
What you do is take a plastic bag and put a rock in one bottom corner, then put the bag over a limb of a plant or tree, tying it off. What happens is this, the plant releases water vapor through transpiration, which then collects at the top of the bag, subsequently condenses, then collects in the bottom corner weighted by the rock, as ready-to use drinking water. The plant purifies the water for you, and anywhere that there are even small, pitiful desert bushes, this method will work. I provide... slightly less than helpful ILLUSTRATIONNNNN.

(No offense intended to small, pitiful desert bushes, I'm sure you have a very refined and proud culture.)