Wine vinegar. I put dried peppers in a coffee grinder and mixed them in vinegar and put them in the fridge. The taste was too strong so I still needed to mix the peppers into something else and the wine vinegar tasted funny. It was cause for some regret. Now I grind up ghost peppers and add them to a cheap green salsa jug from Walmart and shake it well. Tomatillos are better than tomatoes.
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I'd rehydrate in water as that's what was there before, that's why it'called re-hydrate (technically it means water), then, pickle. Keep in mind you will lose the crisp of pickling fresh. Could make a good sauce/salsa blended with other ingredients.