What would be the mass source for a futuristic retreat's reactor?

We have a city, designed to be a retreat. Everything consumed and needed by the population is created via a machine in the middle of this stronghold.

This machine is able to convert matter into another type of matter and into energy.

It could be simplified: We have a really big and efficent fusion reactor in a fixed position.

My question: What would be the best energy source for this type of setup? What could support the reactor for a really long time?

From my other questions I know that I will need a lot of handwavium, at least for the matter-to-matter conversion.

But I want to keep this at least consistent and plausible. So no energy/matter out of nowhere. But where should it come from?

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What would be the mass source for a futuristic retreat's reactor?

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