All consumer sized water ionizers are designed for immediate “point of use” consumption. The water molecules that have been separated and rendered instable through electrolysis will slowly come back into a stable state. This is the reason that ionized water cannot be bottled as its properties are temporary. The antioxidant properties (hydroxyl ions) of alkaline ionized water will dissipate in 18-24 hours, the higher pH properties will come back to a neutral pH level of 7 within 1-2 weeks, and the smaller molecule cluster size will last approximately 1-3 months. It is best to drink alkaline water straight from the Enagic machine, but failing that, store the water in a glass container in a dark, cool place.