@snoei I would like for you to do a taste test. Buy unfiltered water. Make a soup with unfiltered water and then another at the same time with city tab water. Big difference.
Also, boil city tap water in a pot. Once close to empty do not wash it fill it again with city tap water and let it boil down. Do not wash it again. Boil it again until there is no water in it and you will have allowed all the calcium and particles to have surfaced and remained on the bottom of the pot.
Also, all water is best boiled, hard boil, for ten minutes to be sure to rid any water of possible bacteria. Spring water....what spring is it from....how do we know the particular spring is what would be considered safe. So much to reflect on and decide on.
I use purified water, hate buying it, but I do. I bring it to a hard boil and boil it for ten minutes. I also think of it as helping to bring moisture into a dry winter home heated with forced air heating system.
Barbara