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It is well known that “dyson spheres” are pure science fiction without realistic economics or any feasible implementation possibility. The reason is because there is not enough water to boil all that energy into usable electricity.
There is a reason why Dyson spheres are science fiction. That reason is not “there’s not enough water to boil”. If we were to somehow have the technological capacity to build a Dyson sphere it would most likely use some direct light to energy solution, something like photovoltaics. Or if it did need to go light -> heat -> electricity it wouldn’t be using water, it would be using noble gases.
You forget that we would also somehow need to be able to produce more metal that our solar system holds.
You can boil other things, like NaK. Wait, I need to look up boiling NaK now