A method for providing a safe and healthy water and water-based product, comprising: testing pretreated reverse osmosis water to determine whether it meets a first set of pre-defined specifications; introducing a pre-defined nutrient composition into the water, wherein the predefined nutrient composition comprising one or more of mineral nutrients, trace elements and nutritional supplements; testing the water to determine whether it meets a second set of predefined specifications; and disinfecting the water along with its container by UV irradiation from a UV light source to obtain a water product.