If you have ever tasted water at home from your tap, or when you travel away from home; I’m sure you have noticed the difference.
Depending on where you live, water can taste very different from place to place. Primarily this depends on the geology of where your water comes from, Chalk, Peat, Sandstone, Volcanic rocks etc. In addition your local water supplier may clean (remove minerals) or add chemicals to clean the water.
Some people may also have their own springs, provided the water is tested once or twice a year this may be quite usable.
For example I live in a chalk area, and the local water supplier adds Chlorine and may soon add Fluorine to the water. Depending on the time of day the taste and smell of the water changes.
You can of course go to your local supermarket and just buy 25 litres of spring water; fresh from a mountain stream or from a volcanic region in France etc, this can be a cheap way of getting high quality water. Even then different supermarkets may have varying quality and ranges to choose from.