My favorite method involves bringing the water to a boil and throwing in a tea bag or two. When you are seriously thirsty, however, the taste of the water doesn't matter...
Tea is eminently more civilized than iodine. (Haven't used iodine tabs in two decades and don't miss them one bit.)
The iced tea did let me push more water, though, and for me that's important. By the time I'm seriously thirsty, I'm already significantly dehydrated. YMMV
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