Wtf is with these cups
(media.kotakuinaction2.win)
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To a degree.
A limiting factor is that the kidneys need free water volume to excrete waste products accumulating in the blood through normal biochemistry processes.
There's absolute limits to the degree that the kidney can concentrate waste products in urine to preserve volume. Fairly quickly, the waste products backup causing delirium and poor clotting and kidney failure.
You are correct that a few days is probably fine for a healthy person, but the kidneys start breaking down very quickly beyond that without additional fluid volume to replace natural losses and allow excretion of waste.
The body also produces its own water when it burns through the stored glycogen and fats, if you burn enough stored calories, it'd be enough to give the body the minimum it needs to get rid of the wastes. the longest dry fasting record is 21 days
You may technically get some water molecules out of some of the metabolic cycles, but you aren't going to make enough volume to replace losses and keep the kidneys happy.
It's not going to kill you overnight but prerenal failure is going to make all systems deranged very quickly.