The SteriPEN Journey saved our bacon the entire time we were in the jungle. I used a particle filter to create clear water, then dropped the SteriPENin a one-liter container, to create precious drinking water, one liter at a time. SteriPEN uses ultraviolet (UV) light to destroy waterborne microbes. It kills viruses, bacteria and protozoa, including Giardia and Cryptosporidium. 

We gathered water from the river and from the waterfalls flowing off the hills, then purified that water in seconds using SteriPEN, and drank it all day, every day. We also cooked with that water. Of all the devices I carried, this is the one that I give most credit to for bringing all of us out of the wild Bolivian jungle unscathed. The SteriPEN is another device I will never, ever, travel to the most wild regions of the world, without carrying.