Dehydration

Generic Hazard

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.

Water Needs per Day

SizeWater
Tiny1/4 gallon
Small1 gallon
Medium1 gallon
Large4 gallons
Huge16 gallons
Gargantuan64 gallons
^water-needs-per-day

Sources

Player’s Handbook (2024) p. 365