What is packaged drinking water? Packaged drinking water uses water from any source which has to be treated and disinfected, a process that could involve filtration, UV or ozone treatment or reverse osmosis (RO) before it is fit for human consumptiona system where the high concentrated water is passed through a semi-permeable membrane that has micro filters. Adding Mineral System: The RO treated water having less TDS is not good in taste. At this step physical minerals are added in the tank to give them taste and a nutrient level