system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happens to water after I drink it, but before I pee it out?

Also, about how long does the process take?
gpt
The water is absorbed by your intestines into your blood, where it forms the majority of the mass of your blood. It circulates through your body. For any cells, it also serves as the fluid that, among many other things:

* Provides cells their filler
* Allows cell membranes to form
* Provides a medium for chemical reactions to occur
* Works as a lubricant between cells
* Serves as a coolant (via blood or sweat)
* Helps deliver oxygen/nutrients and remove waste (again, via blood)
* Carries materials in lymph system
* Serves as a medium for ions in nerves/muscles (allowing you to think/move)

and finally

* serves as a carrier to urinate out toxic waste products.

How long does water stay in you? Until you die. (It's not really reasonable to say "this water goes here and stays for X time," since it's always mixing. You could theoretically have some of the same water you had since you were born.) You literally use water in every single process of life. Without water, **EVERYTHING** starts failing.