It's a myth you need packaged shelf-stable things on trips.
Just pack a lunch box each morning and put fresh things in it.
People used to do that all the time and now we have stores everywhere you go on a trip - pop in for some meat, veg, and fruit. Or if you are in hotels with that breakfast buffet, grab some eggs, fruit, and bacon. It will not rot before lunch!

If I had a toddler nowadays (I'm a grannie), I would pack a refrigerated bag with baloney, cheese sticks, chicken maybe, baby carrots, apple slices, cucumber, whatever the kid likes.