A hydrator was a device in 2015 that hydrated and presumably reheated dehydrated foods in a similar way to a microwave. They were controlled by speech recognition, as Grandma Lorraine gave the instruction "Hydrate level 4, please!" aloud into a speaker grille on the device, and had at least four levels of hydration. After placing a four-inch diameter dehydrated pizza into Marty and Jennifer's hydrator for twelve seconds, Lorraine brought out a large pizza that was at least fifteen inches in diameter. The pizza was piping hot, but the metal plate beneath it was at normal temperature, as Lorraine was able to handle it with her bare hands.