Sparkling water is water with bubbles of gas in it. A bottle of sparkling water.
The bubbles are carbon dioxide, and they make the water very slightly acid. Sparkling water occurs naturally at some springs, which is where the fashion for it started.
1nounsparkling waterWater with bubbles of gas in it.
“He drank sparkling water all evening and everybody assumed it was gin.”
sparkling water is a drink.
Sparkling plus water, from the glistening look of the bubbles.
From sparkling + water, said to be sparkling due to the sparkly, glistening appearance of the carbonation bubbles in the fluid.
Etymology from Wiktionary, CC BY-SA
Practised in Food & Drink