Very Low-Cost Solar Water Distiller

This seems to me to be a decent emergency preparedness product and they claim it will be available to purchase as early as this Summer for under $30 U.S. The only problem I see is that you would need to purchase more than one unit, as the rated output of 1.0-1.7 liters per 24 hours is not a lot of water at all. In fact, it’s just slightly over a quart, and that at best might be enough to keep one person alive in an extreme emergency with nothing at all left over for cooking, hygiene, et cetera.