Cool Tool: SteriPEN
I took a SteriPEN to Africa for 3 months this summer and the verdict is in: it’s the best water purifier you can carry without a tractor-trailer. It’s basically a UV ray flashlight you submerge into your glass. The water stays cool and it doesn’t change the water, except to kill all the living things in it, viruses included. It is expensive, but pays for itself quickly, as you don’t have to buy bottled water.