* Soda water is made by dissolving carbon dioxide gas (CO2) into water. The CO2 is the gas solute in this solution.

* Salt is a solid compound (sodium chloride, NaCl) that dissolves in water.

* Grape juice is a complex solution of sugars, acids, and other compounds, all dissolved in water. While it might contain small amounts of dissolved gases from the air, it's not primarily defined by a dissolved gas like soda water.