Dehydrate

Choose a target within 60 feet. If the target is living it must make a Constitution saving throw or take 1d8 Necrotic Damage. This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8). This does not affect undead creatures.

If used on non-living plant matter or fresh meat, the moisture is removed from the targets, preventing them from spoiling.

This spell can also be used to preserve a dead body.

In opposite fashion, once the moisture is removed from an entity you can also rehydrate that very same entity, since you know the exact amount of moisture that was removed from it