Sawyer Squeeze Water Filter

The Sawyer Squeeze filters down to 0.1 microns — removing 99.99999% of bacteria and 99.9999% of protozoa. At three ounces, it weighs less than your phone. Screw it onto any standard water bottle or use the included squeeze pouches. No pumping, no chemicals, no waiting. The hollow-fiber membrane is rated for 100,000 gallons, which is effectively a lifetime of backcountry water. It costs $35.