The most effective water purifiers that produce mineral water are reverse osmosis systems combined with remineralization filters. These systems remove impurities through reverse osmosis and then add essential minerals back into the water. According to a study published in the Journal of Environmental Science and Health, reverse osmosis systems effectively remove up to 99% of contaminants, including heavy metals, bacteria, and viruses. The remineralization process ensures that the water retains beneficial minerals like calcium, magnesium, and potassium, which are essential for human health. This combination of purification and remineralization makes these systems ideal for producing mineral water at home.