Soda water is carbonated water. It is also sometimes called sparkling water, or fizzy water. It is water that contains dissolved carbon dioxide. You will see tiny bubbles of gas in the water, in the same way you see them in other carbonated drinks like Coke, Sprite and such, except that this water is not flavored or sugar added. Soda water can be enjoyed on its own and is also often mixed with alcoholic drinks and fruit juice.