Carbon or sand filter, only.

Most others damage the water in some way, either by removing vital minerals, altering its structure, or in the case of the fancy machines, contaminating it with metals like titanium.

Also note that while some waters may be more pure, ie closer to 100% H2O, if they lack the correct balance of minerals, they will not hydrate you correctly, and should be avoided.

Most of the benefits of carbon filters are to remove chlorine.

Other chemicals and metals may be removed, to a varying degree.