Tequila's Dilution Process The dilution of a tequila is when a high grade tequila, which can be of a 55% Alc.Vol. (Alcohol Volume), is added a good-quality demineralized water in order to adjust its levels of alcohol concentration. This level follows the official Mexican standard NOM-006-SCFI-2012 for alcoholic beverages, and can go from a minimum of a 35% Alc. Vol. to a maximum of a 55% Alc. Vol.