When populations of tiny aquatic organisms called cyanobacteria (formerly known as blue-green algae) explode, their toxic ...

bacteria and viruses. It also takes little to no prep or waiting, so you can just fill and drink. The Grayl Geopress is great for backpacking, hiking or camping when clean water may be scarce.

Eating unwashed fruits and veggies might seem harmless, but it hides significant health risks. From bacteria to pesticides, ...