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I have the opposite problem, after one glass of water I feel full and drinking any more makes me nauseous. It’s a struggle to get sufficient hydration during the day.
I'm so interested in this topic, for a weird reason.

Since I was a kid, I've thought I was "prone to migraines", and ascribed various triggers to them - sun exposure, heat, physical exertion, mental exertion, etc. I'd get a migraine sometimes after a long hike on a weekend - and also a long business meeting entirely indoors in an air-conditioned space.

Only when I was around 35, did I figure something out. All these situations lead to me getting dehydrated without any obvious accompanying feeling of thirst. Hiking all day will do it - walking around an outdoor shopping mall on a hot afternoon - or sitting in an all-day business meeting focused on the work at hand and forgetting to drink. And all these situations lead to a migraine - my only "migraine" trigger is simple dehydration, nothing more complicated.

The weird thing is, it took me a long time (decades) to put this together, because I just figured that I couldn't be dehydrated if I wasn't thirsty, and I had no association between "feeling thirsty" and getting a migraine.

I get what I consider normally thirsty in other circumstances, but somehow there's a failure mode where my body doesn't warn me. So now I just remember to chug lots of water (and electrolytes) if I'm exerting myself even if I don't really feel thirsty, and I can systematically avoid triggering migraines.

Now that I understand it the association is quite clear and obvious in retrospect.

There are simple indicators that can tell you how hydrated you are.

1) When did you last urinate, and was it a light or deep colour?

2) Can you make saliva easily in your mouth, or does your tongue rasp around?

That and "Have I had any water yet this morning / afternoon" keeps me hydrated.

In my late 40's I realized I don't get thirsty. I did when I was younger.

I'm also a big sweater so I dehydrate quickly.

I found that I would get dehydrated to the point where my body tissues would reduce in volume or something and my Eustachian tubes would open up. They would either pop as I breathed or actually transmit my breath sounds directly into my ear from my throat. Concerning, yes.

Soon after drinking a lot of water this would go away. I soon realized that I was lacking a sense of thirst and was really stressing my body. Now I make drinking a habit.

Tangentially related, I'm curious to know why it is that proteins are so much more filling than other macronutrients (within minutes)
So dumb to see office workers sipping all day on their gallon water bottles, while outside the workers in the sun on the construction site taking the occasional sip.
i can't stop eating the salt cristals before eating the lunch
I am piloting a super sophisticated mech that is a literal home (primordial soup) for other tiny specs that cooperate together.

And more and more I ask this question. Why? There is only recursive answer, to copy itself, so the copy could continue piloting.

It is poetic and really weird.

I recently learned that the inverse of thirst is called hyponatremic craving. This is when you have too much water and your body craves salt.

It ought to have a better word! “I’m feeling salty” doesn’t work!

Breaking and hauling concrete patios in the Florida sunshine, I learned to take a couple of salt tablets with my gallon or two of water per shift to prevent incapacitating symptoms of thirst. Gatorade was both not enough electrolytes and the sugar spike too quickly dissipated. On the flipside, distilled water strips excess ions.
This article reminded me to go drink water, I had forgotten.
"However, animals like us do not experience salt desire as a powerful, controlling drive as we do with oxygen, food and water." (from the article).

I disagree with that, especially when I was young. I would crave salt. I would lick my hand and sprinkle salt on it, then lick the salt off. I would break chunks off the salt lick block we had for our horses. I would lick the homemade play-doh my mom would make because it tasted like salt.

There's no substantiation for the claim in the article that we lack a salt craving. Apparently, the author hasn't, but I know a lot of people that do.