the entire use-it-once-and-throw-it-“away” mentality
And there’s more …
read about how bottled water companies are stripping water resources from our mountain ecosystems (Sierra Club pdf)
What you can do …
use reusable containers (carry your own mess kit).
don’t get distracted by the dizzying array of water bottles for sale. remember that’s runaway consumption too! you only need one, and you can make do with something as simple as a mason jar.
use tapwater (unless you know for sure that location’s tapwater is polluted)