Firstly, even if you order a generic Kosher meal, it will probably arrive as a Kosher lePesach meal, and even continue to do so, for about a week after Pesach, till the airlines have liquidated all their Pesach supplies.
As to what you should bring with you:- Any Kosher lePesach food you like, as long as no liquids, for security. But you will probably end up not needing it, since it is almost certain the Kosher meal shall be Kosher lePesach.