Found this item called the Thirst Aid via Gizmag.

From their website:
"Our advanced water filtration technology enables the user to get water from just about any source, from drainage ditch and muddy puddle to a standpipe, and be confident that the Thirst Aid pouch will remove it's contaminants."

Thought it was interesting. Anyone tested this yet?

BTW - It's been a while since I've been here. Good to be back.