You can drink from fountains. The biggest purpose of a fountain is to ensure that everyone has access to potable water in Switzerland. There is mineral water coming out from the tap in the kitchen. So, when a waiter at a restaurant brings you a glass of tap water, it’s totally safe to drink.
In case you're wonder:
NR 4 Im paying around 420 US$
NR 5 Change your Doctor and Insurance
NR 15 In every house is NOT true. The have splitted Streets in Areas, where Areas own Bunker-Rooms