The Compendium of Caraka 6.22.19

6.22.19

nāgniṃ vinā hi tarṣaḥ pavanādvā tau hi śoṣaṇe hetū/
abdhātorativṛddhāvapāṃ kṣaye tṛṣyate naro hi//

For there is no thirst without fire or without wind; indeed, those two are the causes of drying. / A person becomes thirsty when the water element is greatly increased [in loss], that is, upon the depletion of water.