Sawyer Products MINI Water Filtration System Price: $18.69$78.76 (as of 05/06/2018 19:24 PST- Details)

Removes 99.99999% of all bacteria, such as salmonella, cholera and E.coli; removes 99.9999% of all protozoa, such as giardia and cryptosporidium
Fits most water bottle threads
So light and compact it fits in the palm of your hand