You've got to see this water purification system

[William]

It uses UV light to purify the water without filtration and one unit uses no batteries; http://www.survivalschool.com/products/Water_Purification/SteriPen_Sidewinder.htm

[ErikPrice1@msn.com]

 That is a very cool system. I've got a couple of the survival straws but this is way better if it does what it claims. Talk about an item to put in a rig or a grab and go bag. Thanks for the link.