Grayl Geopress Purifier Our bodies are around 60% water, depending on age and gender. Some sources suggest you should drink between 2.5 to 3.5 litres a day, and that’s without adventuring and doesn’t include beer. How can you keep up with that regimen while out in the mountains and still safely avoid unwanted bacteria?  One quick answer would be water purifying tabs or drops that … Continue reading Review: Grayl Geopress Purifier