I'm not aware of any backpacking filter or common chemicals that will neutralize ag chemicals or heavy metals. Research your sources in advance. If you can't, I'd carry it all or cache it. Charcoal will help with smell/taste. I'd use Aqua Mira and then gravity filter with an Aqua Mira Frontier Pro most likely, but if you're not wanting to wait at all (no chemicals) you'll need a filter with pore size small enough to get bacteria (~ 0.1-.2 micron) and hand pump it. The Frontier Pro is 3 micron. Viruses aren't much concern in the US.
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Water Filters: advice neededPage Title Module
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