Why do you want to drink more and more of certain waters but still feel …

Why do you want to drink more and more of certain waters but still feel thirsty, while other waters seem to quench your thirst much faster?

The keyword is "aquaporins".
Aquaporins are very, very fine channels in the cell membrane that connect the cell interior with the exterior. The Nobel Prize in Chemistry 2003 was awarded for the discovery of these channels in cell membranes, split equally between Peter Agre "for the discovery of water channels" and Roderick MacKinnon "for structural and mechanistic studies of ion channels". You can find how these discoveries explain the phenomenon mentioned above here➡️