A gas generator includes a reactor and a reactant. The reactant includes nitroalcohol, and the reactor is operable to decompose the reactant to generate a gaseous product. Also disclosed is a reactant system for generating a gaseous product. The reactant system includes at least first and second reactants, one of which includes nitroalcohol. The first and second reactants are cooperatively thermally decomposable to generate the gaseous product. A method of providing a reactant system for generating a gaseous product includes contacting a first reactant with a second reactant, and the first reactant includes nitroalcohol.