It does not.
You do not add electrons to oxygen to make water. If you add electrons to oxygen you create ions. O and 2 elections would become a O^(-2) ion
You make water by combining oxygen and hydrogen atoms to a single molecule.
It can be the case that you have dissolved hydrogen ion. H^(+) and that react with oxygen and the electrons come from another source but you create water will oxygen, positive hydrogen ions, and electrons.
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