Nothing Water is comprised of glacier melt, rainfall, and snow melt. When the glacier retreated it stripped the mountaintops of vegetation; consequently, there is little plant life that would put organic contaminants in Nothing water as it begins its journey atop the mountain wilderness.
In the Osa Valley beneath the mountain range, Nothing water collects in a subterranean aquifer. Thanks to the deposits left behind by the glacier, this aquifer is a rare encapsulated artesian formation, protecting Nothing water from ground contamination. As a result, Nothing water completes its geological journey as pure as it began. (from Nothing Water)