By the time you feel thirsty, you are already dehydrated. And you may unwittingly increase the problem by drinking, say, coffee, which is widely considered to have diuretic properties. Alcohol too is a diuretic. If you are thirsty, you would be much better slaking your thirst with plain water. Salty drinks are clearly inadvisable, and sugary drinks also tend to increase thirst. You are not in need of vague 'liquid'; you are specifically in need of PLAIN WATER.
So a major, rather strange, consequence of taking these dangerous, over-prescribed drugs, is that while taking them you tend to be chronically thirsty (particularly if taking a high dose), and chronically in a state of dehydration, yet carrying around with you a lot of excess water, mainly in your blood vessels, particularly in your poor, over-stretched, weakened, increasingly painful veins. See my website for helpful information and suggestions relating to these problems.