Why not "You do not have to eat this meal with a spoon"?
I THINK your version might be "Tohle jídlo nemusíš jíst lžící."
must not is not the same as not have to, must not means you are not allowed.
Why You must not eat this food with a spoon is incorrect and the underlined "wrong" word is must[??? food is not equal to jidlo here?
It was overlooked, and has been added.
Should be dish rather than meal, shouldn't it?