I’m trying to point out to you that you are thinking as humans think and not as God thinks.
Several saints have survived on only the Holy Eucharist and water — I believe during Lent.
Now think as God might seeing these people make that sacrifice, please.
That’s great that people have survived eating only wafers and drinking water during Lent. However, that still has nothing to do with the context of John 6. Jesus was contrasting material food with spiritual food.
Your rebuttal is not an adequate arguement from the scriptures.