Hand-Powered, Battery-Free UV Water Purifier Fill it, Crank it, Drink it! Perfect for Campers or Emergency use. SteriPEN® Sidewinder, the first portable UV water purifier to require no batteries, purifies 1 liter of water in 90 seconds. The SteriPEN Sidewinder features our proven UV system to destroys waterborne bacteria, viruses and protozoa such as giardia and cryptosporidium. This hand-powered system is eco-friendly and can save thousands of plastic bottles from entering landfills. The long lasting Sidewinder purification system includes a one-liter Tritan™ BPA-free bottle and SteriPEN® Pre-Filter for use prior to treatment if the water contains particulates. This long-life, storable water purifier provides 8,000 treatments is ready for emergency situations whenever the fresh water supply is disrupted. With the SteriPEN Sidewinder, you can crank up safe drinking water anywhere, anytime.