This is the most important preparedness item that gets very little attention in the preparedness community but its the first thing you will be seeking when it all goes down.
Parabolic Solar Cookers
Berkey water filters
MSR Guardian Water Filter
MSR Guardian (Worlds Most Advanced Water Purifying System) Backcountry Water sources
Steripen (UV filter)
Steripen ULTRA Katdyn Water Filter
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