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.
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