We need a source of neutrons. These are composite particles of an electron bonded to a proton. Hydrogen gas has an all voting electron, and easy as this all worked in motion which case the sub atomic particles apart.
So we ionise hydrogen gas, and then shine a red hot emitter into a chamber filled with naked protons. We pump out the hydrogen gas from the base, and the device will emit neutrons at random.
So my idea would be to immerse this neutron generator in a tank of water. We will get
We use the heat to drive a steam process which generates power, A tiny fraction of which we take our to generate the neutrons.
A are simpler idea would just be to buy a a neutron generator. Again we run a steam process. And generate power.
We council regular water, and generate oxygen and electricity. Simples.