Mineral water

Water from a naturally occurring spring overflowing onto the land surface, containing various minerals, such as salts )of calcium, magnesium, sodium), alkali, and sulfur compounds. Mineral water may be fizzy )("effervescent" or "sparkling") due to contained gases.

The quality of water discharged by springs can vary greatly because of factors such as the quality of the water. Some commercial mineral water is artificial ("synthetic") prepared in the lab. 

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Relative proportion of minerals in mineral water products 

Calcium 
Magnesium 
Bicarbonate 
Potassium 
Sodium 
Chloride 
Sulfate 
Total Mineral Content 

Gerolsteiner Sparkling
Relative proportion = 1 Liter (mg/Liter) | Percentage = percentage of recommended daily intake
Calcium  348mg|35%
Magnesium 108mg|27%
Bicarbonate 1.816mg|-
Potassium 11mg|0%
Sodium 118mg|5%
Chloride 40mg|1%
Sulfate 38mg|-
Total Mineral Content 2.479mg

Borjomi 
Calcium 85mg|9%
Magnesium 85mg|21%
Bicarbonate 3.965mg|-
Potassium 30mg|1%
Sodium 1.478mg|62%
Chloride 393mg|12%
Sulfate 50mg|-
Total Mineral Content 6.086mg
 
San Pellegrino
Calcium 179mg|18%
Magnesium 52mg|13%
Bicarbonate 239mg|-
Potassium 0mg|-
Sodium 33mg|1%
Chloride 54mg|2%
Sulfate 445mg|-
Total Mineral Content 1.002mg
 
Perrier
Calcium 155mg|16%
Magnesium 6mg|2%
Bicarbonate 445mg|-
Potassium 0mg|-
Sodium 11mg|0%
Chloride 25mg|1%
Sulfate 46mg|-
Total Mineral Content 688mg
 
Evian
Calcium 80mg|8%
Magnesium 26mg|7%
Bicarbonate 360mg|-
Potassium 1mg|0%
Sodium 6mg|0%
Chloride 6mg|0%
Sulfate 12mg|-
Total Mineral Content 491mg
 
In the table, the mineral content for products is based on those values reported by the respective product manufacturer. Where the manufacturer reports a range of mineral values, the average of that range is reported.