It’s true that various minerals are essential for the proper functioning of the heart and the rest of your body. A very important point to remember is that the minerals must be in a form that the body can readily assimilate and use. The minerals that are found in water are in an inorganic form, and are a result of the water dissolving the minerals from the rocks and soil that it comes in contact with. Inorganic minerals are in a form that is poorly assimilated by the body. We cannot get our minerals, calcium for example, by sucking on a rock. For proper adsorption of minerals we need to get our minerals from a plant source. A simple rule to remember is; plants use inorganic minerals such as rocks and soil; animals (humans included) use organic minerals, which comes from plant sources, or from animals that have consumed plants.
In fact, inorganic minerals such as is found in water, can be considered to be contaminants, because your body has to eliminate them from the body. Dr. Peter Lodewick, the author of the book, A Diabetic Doctor Looks at Diabetes, recommends that people, especially diabetics drink distilled water so their bodies don’t have to go through the stress of eliminating the inorganic minerals.
Finally, even if the minerals in water were in a form that was usable by the body, the minerals are often intermingled with other contaminants that are not beneficial, or possibly even harmful. (Examples; metals such as lead, mercury, arsenic, solvents, pesticides, herbicides, other chemicals or biological contaminants.)