Mineral water

60% of Switzerland's total area consists of the Alps. The Swiss Alps contain countless valleys, waterfalls and glaciers from which flow an infinte source of pure, mineral water. The only impurities in the drinking water here are from the plastic bottles into which it is packaged. But you would have to be a nut to buy bottled water here - there are taps, pumps, water fountains, water features, etc everwhere providing a constant source of pure water directly from the Alps. You could drink the toilet water here and it would probably still be pure. Water is the one thing that you don't have to pay for here. Oh, that and public toilets.