the.com/sparkling water

means Water carbonated with dissolved CO2 gas, giving it fizz, bubbles, and a sharp bite on the tongue.

from The fizz comes from carbon dioxide dissolved under pressure, a trick nature does naturally in some mineral springs (the word 'seltzer' even traces back to Selters, a German village famous for its bubbly spring water). Bottled versions go back to the 18th century, when scientists figured out how to infuse ordinary water with carbonic acid gas artificially — essentially bottling what springs did for free, so everyone could have a little bite with their drink.