The reactants for salt (NaCl), carbon dioxide (CO2), and water (H2O) are:

* Sodium bicarbonate (NaHCO3): Also known as baking soda, this is the primary reactant. When it reacts with an acid, it produces carbon dioxide, water, and a salt.

* An acid: This could be any acid, but a common example is acetic acid (CH3COOH) found in vinegar.

The chemical reaction is:

NaHCO3 (sodium bicarbonate) + CH3COOH (acetic acid) → CO2 (carbon dioxide) + H2O (water) + NaCH3COO (sodium acetate)

Note: Sodium acetate is the salt produced in this specific reaction.