I have a Grayl and I carry it (as a canteen). I live in the desert south west. I value it, but for me it's a little like wishful thinking. Obviously you need water, any water to make use of it. Located in the rural part of my county outside of cattle tanks and swimming pools I know of only two natural water sources within 10 miles of my house. These are mostly available seasonally only. Here, on foot, your hike is really limited by the amount of drinking water you can carry.
Stay hydrated and healthy.
I have a Grayl and I carry it (as a canteen). I live in the desert south west. I value it, but for me it's a little like wishful thinking. Obviously you need water, any water to make use of it. Located in the rural part of my county outside of cattle tanks and swimming pools I know of only two natural water sources within 10 miles of my house. These are mostly available seasonally only. Here, on foot, your hike is really limited by the amount of drinking water you can carry.