Your bladder and bloodstream.
Your stomach is not a bag of fluid. Your intestines allow water into the bloodstream. The blood circles your body.
Independently, a completely different mechanism in your kidney filters the blood and, if it’s problematic, filters out the excess water and puts it into the bladder. The bladder is what makes you want to pee, and where the pee comes from.
Even Wiki will tell you in the first paragraph – after 300-500ml your bladder will want to empty, but it can hold far more.
[https://en.wikipedia.org/wiki/Urinary_bladder](https://en.wikipedia.org/wiki/Urinary_bladder)
This is also why you can die by drinking too much water too fast… it will water down your blood quicker than your kidneys can deal with it.
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