There's all kinds of good info on that link about more than just chemical water purification. I found the entire page quite interesting and informative. Thanks for sharing it. No doubt that boiling is the best method. I always prefer to boil water instead of ingesting a bunch of chemicals whenever possible. If I I could boil a pint of water in a 1'sq piece of foil in 15min (or heck even 30min) that would solve a ton of problems for me. Unfortunatly my foil-water boiling skills (or lack of skills) leave much to be desired. I cant get water to boil in foil.... heavy duty reynolds wrap, if youre curious. I also can't carry anything larger in certain situations either, which is why I'm not packing up 30 MP-1 tabs, my trusty Bota bottle filter and a 16oz tin cup. <img src="/images/graemlins/smile.gif" alt="" /> Believe me if I could, I would (and I do when space and weight limits permit) pack all of the above and the problem would be solved with redundancy. This may be highjacking my own thread (...LOL the irony...) but if anyone wants to explain the finer points of successfully boiling water in foil, you have my undivided attention.