# 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](Mechanics/CLI/rules/conditions.md#Exhaustion) level at the day's end. [Exhaustion](Mechanics/CLI/rules/conditions.md#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** | Size | Water | |------|-------| | Tiny | 1/4 gallon | | Small | 1 gallon | | Medium | 1 gallon | | Large | 4 gallons | | Huge | 16 gallons | | Gargantuan | 64 gallons | ^water-needs-per-day *Source: Player's Handbook (2024) p. 365*