tap water that has been filtered and carbonated. No mineral or sodium salts are added, which distinguishes seltzer from its cousin, club soda.
Sparkling water is man-made water that contains natural or added C02 in the same amount the water had from its source.
Artesian water is water collected from a drilled well into an aquifer (a body of aturated rock through which water can easily move). This water is confined by a layer of clay or rock, which pressurizes the water enough to allow it to rise up through the ground without mechanical pumps.