Sawyer Mini Water Filtration - Amazon $13.68
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https://www.amazon.com/gp/product/B00FA2RLX2/ref=ox_sc_mini_detail?ie=UTF8&smid=ATVPDKIKX0DER&th=1
Ideal for outdoor recreation, hiking, camping, scouting, domestic and international travel and emergency preparedness
• High performance filter fits in the palm of your hand; weighs just 2 ounces; 0.1 Micron absolute hollow fiber membrane inline filter
• Attaches to included drinking pouch, standard disposable water bottles, hydration packs, or use the straw to drink directly from your water source
• Removes 99.99999% of all bacteria, such as salmonella, cholera, and E.coli; removes 99.9999% of all protozoa, such as giardia and cryptosporidium
• Filter rated up to 100,000 gallons; includes 16-ounce reusable squeeze pouch, 7-inch drinking straw, and cleaning plunger
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Expired - now back at $20