Tape
[I'm whispering this so the beginners won't hear me. In the Sierras we used to just carry a straw. I bet I could drink fom our wild and scenic river that flows through town with just a straw too. Where I hiked with Bigfoot we didn't need a filter either but don't tell him since he put chemicals in his water. I normally just dip my pan in the water since I rarely drink water without coffee in it anyway.] keep it quiet.
Jim