The only ways I can think of are using it for fusion reactions (which only works with heavy water) or taking separating the hydrogen atoms, striping off the electrons and firing them into something with a particle accelerator.
In both cases, some of the water has been converted in a way that is extremely difficult to turn back to water again as you’d have to use a different nuclear reaction to get back to hydrogen again before being able to make water out of it again but they’re also both pretty extreme edge cases
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