Minerals end up in the spring water due to the water slowly filtering down through layers of soil. The minerals in spring water are in fact minute particles of dissolved stone. The compilation of the soil and the whole geological history of the site determine the structure of the minerals and with that the taste.
In addition to underground springs, which can only be accessed by drilling, there are also many natural springs. In mountainous regions, for example, rain falling on the mountain seeps into the soil. When the water encounters a layer that is difficult to penetrate, it slowly seeps over this layer to finally collect at the edge of a mountain or hill.