The body's natural algorithms, like thirst signals, are reliable processes that the brain should trust.

“the very nature of our body's metabolic and cognitive processing is that we can trust it that we should trust it that we need to trust it at times when we need oxygen sensors in our blood tell the brain that too much CO2 has accumulated in the blood and so we hyperventilate when we need water sensors in our organs tell us to feel thirsty when we're hungry horny tired you name it these are all us giving into a natural algorithm that Evolution made for us gave us and never asked whether we wanted and we know it's an algorithm because it can be turned off in special cases those Afflicted with rabies are afraid of water no matter how thirsty they get this is on its face absurd the conscious mind should obviously be demoted in certain extreme cases like that why not in all cases”