Grayl Water Purifier
It’s likely you already know how to use the Grayl Water Purifier without outright knowing it. Built like a french press, just fill the outer cup with suspect water, press the inner cup into it with a steady downwards pressure — like you’re sequestering coffee grinds — then drink the clean resulting water. Inside the bottle is a purifier that makes water safe from virtually any fresh water source (sorry, no salt water). It removes bacteria, protozoa, and virus (so it’ll keep you safe anywhere in the world) plus many chemicals and heavy metals, flavor and odor. In other words, it removes the full spectrum of impurities that can make you sick. Each is good for filtering a total of 40 gallons, or about 300 uses.
Grab one at Amazon – $60 to $90