It’s literally less than a cent (euro or dollar) for a whole bottle of tap water.
Out of curiosity I checked the price I pay for tap water in Portugal and 1 m³ (1000 l) costs around €0.5, so a 2l bottle of tap water contains all of 0.01 euro cents worth of it.
You do realise that tap water isn’t free in many European countries, right? Buildings have a meter and the owner or tenant gets a bill every month.
It’s literally less than a cent (euro or dollar) for a whole bottle of tap water.
Out of curiosity I checked the price I pay for tap water in Portugal and 1 m³ (1000 l) costs around €0.5, so a 2l bottle of tap water contains all of 0.01 euro cents worth of it.