How might European mineral water be carbonated before being sold to the consumer?

Answer

It can be naturally carbonated from the earth or artificially carbonated before sale

Mineral water in Europe presents flexibility in its carbonation status at the point of sale. Some waters retain the carbon dioxide ($ ext{CO}_2$) that was naturally dissolved in them as they passed through the earth, making them naturally carbonated. Alternatively, many mineral waters are bottled in their still form and subsequently undergo artificial carbonation before they are packaged for retail. This flexibility allows producers to offer the same mineral profile in both still and sparkling versions to satisfy diverse consumer preferences.

How might European mineral water be carbonated before being sold to the consumer?
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