There is no single “healthiest” mineral water for everyone; the best choice depends on your goal and health profile. In general, plain mineral waters with (1) low-to-moderate sodium, (2) meaningful magnesium and calcium levels, (3) transparent, regularly published analysis values, and (4) no added sugar or flavorings are often preferred. If your aim is mineral support, focus on magnesium and calcium. If you are sensitive to blood pressure or fluid retention, prioritize lower sodium. For chronic conditions (hypertension, kidney disease, heart failure), individualized selection with a clinician or dietitian is the safest strategy.