Boy, are there a lot of water treatment options out there. Right now, I'm leaning towards some sort of inline filter like the Sawyer micro or the Aquamira frontier (the frontier is the only one I'm aware of than handles viruses), or a chemical treatment like aquamira. The straw seems like it has a higher throughput. Some of the chemical treatments demand a four hour wait time, which isn't really feasible if someone is using multiple liters in a given hour.
One issue that seems to come up quite a bit is filling the container from very shallow streams or other sources. This makes me wonder about using a water bottle with a specialized cap; one hose could run from the water source, through the cap, and down to the bottom of the bottle, while another hose from the cap could be sucked on by the user to draw water into the bottle. The hose in the water source could have a prefilter on it, while the suction hose could have an inline filter to avoid aspirating any contaminants. Come to think of it, such an arrangement could be used to prefilter any source, not just shallow sources.
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