Liquids with a pH value between 0 and 7 are acidic, those above 7 are alkaline. Mineral water should be as neutral (as close to 7) as possible. Teeth are decomposed by acid over time. Adding CO2 increases the acidity. -o- The pH value indicates the concentration of hydrogen ions (H+). Mathematically, this is expressed as pH = -log10(H+). -o- Here are some mineral waters in Switzerland with their pH values:
Aproz 7.5, Aquella 7.5, Knutwiler 7.7, Levista+2 7, Levista-N 7.5, M-Budget 7.6, Pure Swiss 8.1, San Bernardino 6.22, San Clemente 6.65, SwissEau 6.46, SwissMountain 7.3, Seewasser Genf 8.16, 7.96, Grundwasser Genf 7.7, Termen 7.5, Valais 7.6, Valser 6.5. -o- You can find out more about mineral water at Water from around the world, where I took the values from. This site in German and English is very informative and has a lot of information about the "Wässerli". You can search by country, sort by alphabet or acidity etc.