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Water created by combining hydrogen and oxygen, rather than extracted from natural sources—the ultimate synthetic product, because it's identical to natural water but costs way more to make. Synthetic water is what astronauts drink (recycled from everything) and what desert cities dream about (if they have unlimited energy). The chemistry is trivial: burn hydrogen in oxygen, collect the water. The economics are brutal: it takes energy to make hydrogen, energy to burn it, and the resulting water costs many times more than just collecting rain. But for places with no rain—space stations, Mars colonies, arid regions with deep pockets—synthetic water is the only option. It tastes exactly like regular water because it is regular water, just with a much higher price tag and a better origin story.
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