Simple past tense and past participle of rehydrate. (verb)
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Use "rehydrated" in a sentence
"Over the decades, he has seen space dining evolve from having food in a squeeze tube - and astronauts going hungry - to shuttle crews now personally selecting their meals months in advance of a flight and enjoying items such as rehydrated"
""If they're infected, once they're rehydrated and distributed, they could take the bacteria anywhere.""
"The healthcare people eventually took pity on me and broke the cycle, but only after I had to go to hospital a couple of months later to get rehydrated by IV drip after 10 days of food poisoning."