What is the ruling on breaking an oath not to bring "Indomie" after swearing to do so, what is its expiation, and is it permissible to bring it after the expiation has been performed?

If the situation is as you described, then you have broken your oath, and expiation (kaffarah) is incumbent upon you. This expiation is feeding ten poor persons, or clothing them, or emancipating a slave. If you are unable to do any of these, then you must fast for three consecutive days. By doing so, your oath is dissolved, and the expiation does not need to be repeated if you go back to buy the aforementioned item; because once the oath is broken, it is dissolved and does not become binding again.