Carbonated water obtained either through natural underground springs or made by dissolving CO2 gas in water. Carbonation lasts longer in naturally carbonated waters.
Usually tap water filtered and carbonated. No mineral or mineral salts are added.
Low mineral content water. Usually comes from deep in the earth with its principal mineral being sodium. Will dissolve soap better and will not leave a ring around the bathtub. Will dissolve minerals such as lead from pipes.
High mineral content water. Usually comes from shallow ground that has high concentrations of calcium and magnesium. Hard water leaves rock-like crystals.