I have also used a Sweetwater filter with good results
I used to use one, but my biggest pet peeve was the way it let you know you had filled up a bottle or had a dirty cylinder was to squirt you without warning!
I currently use a PUR hiker and love it. I use the ubiquitous MP-1s as a backup. And of course there is always boiling.
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When the SHTF, no one comes out of it smelling pretty.
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