So with people travelling more but airports and airlines trying to ramp back up, here's a question for you all. Do you bring backup food and if so, what?

Example. The last trip I took was YYZ to SIN via TPE (EVA). YYZ to EVA leaves dead of night and arrives at roughly 4:30am (well ahead of schedule). Even after clearing security to be let back airside, most of the concessions hadn't opened yet (or were starting to but definitely not ready to take customers). If it wasn't for the fact that I had a 6" sub (pizza minus the sauce, not that it matters) handy, I would have been hungry for two hours.

Personally, I've tried big-chain burgers (never again) and pizzahut (also never again). Tried cup noodles (but can't always find hot water)... might try breakfast sandwiches next time... would love to have a decent salad if I can figure out how to get the dressing past screening...

But what have you (dear readers) brought to consume on the plane (eg, can't because of allergies or some other circumstance) or at the airport (before or after hours)?