You won't have a potato anymore. But you won't have water anymore either.
You'll have a black hole.
https://en.wikipedia.org/wiki/No-hair_theorem
We don't know if black holes have hair, so the answer to your question is "We don't know".
https://en.wikipedia.org/wiki/Black_hole_information_paradox
You won't have a potato anymore. But you won't have water anymore either.
You'll have a black hole.