Like an emergency backpack for adults I would provide an emergency backpack for kids. This backpack can have a few necessities like a life straw for clean water, high nutrition energy bars and a blanket but it will also have a GPS tracker sewed in so that when the backpack is distributed the aid organisations can track the kids whereabouts.
I would see is as follows: you handover a backpack, make a picture of the kid (no long subscription paper and if it's recognized by a family member you are able to track where the kid is staying.