Simply speaking, reduction refers to getting and losing electrons. In case that water is reduced, it is classified into alkaline water and acidic water. That is, this refers to increasing and decreasing of pH (hydrogen ion indicator: hydrogen quantity in the water) in the water. Alkaline water refers to the water abundant with hydrogen ions.
Alkaline ion water refers to the water activated on the negative (-) side in the electrolysis of the distilled water though high efficient filters. Such water has so abundant with various minerals and reductive capacity that even academy recommends of drinking it for health for a long time.