in case of weather event, civil strife, or economic collapse

Except for our elite, we're a third world country too now...Except for the world's economic elite, the whole world is a third world country...
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...solar water disinfection, improves the microbiological quality of drinking water, using solar UV-A radiation and temperature to inactivate pathogens...
sodis.ch
electricitybook.com/solar-water-purification
...setting...water out in the sun on a [dark surface] for a couple of hours...The combination of the sun's ultra violet rays and heat kills any pathogenic...may save your life in an emergency situation. After a storm or a flood or some other natural [or unnatural] disaster, you may not have access to clean water...simple solar water purification "technology"...
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Pennsylvania Interfaith Climate Change Campaign
webofcreation.org/ncc/Regional/Pennsylvania/penn.html
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Coalition on the Environment and Jewish Life
coejl.org
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