I have 3 sources:
Geothermal water with high mineral content from an underground source that's been untouched by pollutants.
Rock water that flows through rocks at a high altitude with a good amount of minerals from the rocks. Not sure how clean it is, don't care.
High mineral water from an underground lake under a dead volcano in Germany (Gerolsteiner). <-- I drink this because I'm originally from there, area is called Palatinate, volcano is called Donnersberg (Mountain of Thunder), our local Co-op imports it.