I think those new rations use the water filtering technology that is referenced in the original post.

http://www.hydrationtech.com/merchant.mv...tegory_Code=HPR

It's an interesting piece of equipment to consider for survival conditions if it works the way it's advertised. They have several different sizes, but, the one I referenced above is a 2 liter flexible container. You place it in any source of water, and it filters bacteria, viruses, cysts, etc.

There are other versions,like the one originally mentioned, which is re-usable 3 times per day for 10 days, which sounds very interesting.
The company lists several branches of the US Military as customers.

Getting back to the original question about the water purifier, has anyone actually used or have experience with these units?