Starvation and Thirst

When creatures can't eat or drink enough to survive comfortably, they're fatigued until they do. After a number of days without water equal to a creature's Constitution modifier + 1, the creature takes 1d4 damage each hour that can't be healed until it quenches its thirst. After the same amount of time without food, it takes 1 damage each day that can't be healed until it eats.