Curse of Self Drought

You cause a creature or humanoid to suffer from unbearable thirst.  The victim must succeed a Wisdom Save against the spell keeper's DC or they will be wracked with an unquenchable thirst.

If the creature/humanoid fails the saving through,  they must make a Con save each turn (DC10+ casters Con bonus) to be able to perform any actions (Action/Bonus/Movement) during their turn.  If the fail, they must consume the nearest source of liquid.  At the end of each turn, they must make another Wisdom Saving Through (caster's original DC) to end the illusion or until the spell is dispelled or the caster is killed.

Depending on whatever the creature consumes for liquid, they take damage as applicable.