10.64.27.19 Comments You will need to produce about 7 millimole of gas. There are two ways to go about this using only one substance in addition to water. First, add a good reductant.
Some good choices are sodium and potassium.
Regrettably, the gas produced is hydrogen. As it mixes with the oxygen in the air, it generally causes the explosive formation of water. I wouldn't recommend this. Your other choice is to add a good oxidant. The gas produced is oxygen, which is certainly nontoxic.