Many years ago, I've learned that, with those words, you indicate a water with gas. I'm not the better guy to translate from english, but, if this is correct, You generally BUY them. Whem I was a child, in Italy you were able to find some boxes of powders (Idriz or Idrolitina) to do a sparkling water home-made. Only, you were compelled to have a bottle with a spring cap.
You can find them also now, but they are not used so often: the most of us buy mineral waters, that are very cheap in Italy: every Supermarket has dozens of mineral waters, more or less gasified, curative or not, from 20 c to 1€ a bottle,
It's also possible to have a depurated and refrigerated sparkling water directly from tap, applying a kit whose price is about 1000 €.