You can carry banana, finger food, biscuits. I used to carry some hot water in a flask along with a powder called MANNA HEALTH MIX. . Used to mix that and some jaggery powder in hot water and give in the form of porridge to my kids.

finger foods,fruits, thepla, parathas, yogurt cups

if you are giving cerlac please carry that, carry apple and Banana. I am also traveling this month with my son for his mundan and I plan to carry these along with formula for him as he is only on formula.