well a bit more to it than that but check out the link for the details.you need more than a stick of course but nothing that you could not carry in a BOB or have around the house.
college students ran the tests and had %99 effective results.
four quarts a day with one unit and they sound easy to make.
plastic tubes,hose clamps,glue and no rocket science needed.

http://phys.org/news/2014-02-filter-sapwood-tree.html

one of the guys at bwca.com sent in this link to the paper on the stick filter this morning
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0089934
clears up a lot of questions.

Thanks for this post. Very interesting and potentially promising.

Our ancestors obviously relied on pure nature much more than we have in the 'space' and 'information' ages and I find it comforting to be reminded once again that nature provides.

Promising, but not a complete solution:



I look forward to further results from this group.