Dehydration

A creature requires an amount of water per day based on its size, as shown in the Water Needs per Day table. A creature that drinks less than half the required water for a day gains 1 Exhaustion level at the day's end. Exhaustion caused by dehydration can't be removed until the creature drinks the full amount of water required for a day. See also "Exhaustion."

Water Needs per Day

Size, Water, Size, Water

Tiny, 1/4 gallon, Large, 4 gallons

Small, 1 gallon, Huge, 16 gallons

Medium, 1 gallon, Gargantuan, 64 gallons