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bigshot
Since: Dec, 2021

I may have found it via Pointless Sites
or Explorable Explanations
. It was a minimalistic artstyle animation (no shading, lineless, clean shapes) detailing a person's real experience with this sort of soda that flavored itself with the cap, if I remember right, or it just depended on how you opened it.
EDIT: If you know the name of the soda, that might help me find the animation.
Edited by bigshot