On previous excursions I have merely used a few drops of household bleach to treat my water. (Figured safe as recommended in emergency preparedness literature AND close to how cities treat their water) However next year I'm planning a thru hike. Do you think it's safe to use for 6 months? I can't figure why so many hikers use Aqua Mira or other product if bleach is safe because its so readily accessible and cheap. Any information or thoughts would be appreciated.