I have been using Sawyer filtration system since last 1 year and been fine after drinking water from a canal and mountain streams so I guess it working.
https://www.amazon.com/Sawyer-Produc...65&sr=8-2&th=1
Another option is
https://www.amazon.com/LifeStraw-Per...s%2C265&sr=8-9
Added advantage being you can straight drink from a stream. Pretty lightweight systems both of these.
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