I hadn't seen this post or I would have replied sooner. I go backpacking & camping a LOT. I use this: https://www.amazon.com/Hiker-Microfilter-S-N/dp/B009T7IYIA/ref=asc_df_B009T7IYIA/?tag=hyprod-20&linkCode=df0&hvadid=242012186291&hvpos=1o2&hvnetw=g&hvrand=15510471062286967889&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9015329&hvtargid=pla-455760388252&psc=1
It's very simple, no chemicals and after heavy use in waterways with a lot of sediment, or 3 to 6 months regular use you can just replace the filter. I've had mine for 20+ years.