Is there a living thing that doesn't need water?

The Deset WoodRat (Neotoma lepida) can get enough water from the foods it eats.

desert-woodrat

absolutely no

every organism we know of needs water to survive.

you may hear about animal that live without drinking water; but get water from food

you may hear about organisms that can live with so little water or get dormant in absence of water.

But no active organism can live without water