While not all of Switzerland‘s water comes directly from a mountain spring (in fact 70% of Zurich‘s tap water is taken out of the lake), the water quality is generally excellent. Normal tap water is always drinking water, as is water from public fountains of any kind, except in the rare cases when a sign (reading Kein Trinkwasser/ Eau non potable/ Non potabile) states otherwise. Tip: carry an empty plastic bottle with you and fill it up at one of the many fountains or the brass drinking-fountains throughout the city. The exception to the rule is tap water in trains: don‘t drink it. If you‘re thirsty on a train journey, you‘ll just have to hope the minibar service arrives soon.