Day One. The most essential things are protection from exposure and sustenance, in the form of easily digestible caloric intake.

Timing is critical - on the first day it is probably impossible to provide instant adequate housing for everyone. So what can be provided to maximize chances of survival?

Airdrop hats and chocolate

Easily transportable items that can help survival are:

• Hats and socks - warm "beanie" style hats greatly reduce heatloss. Warm socks are valuable, though less critical as most people will already have socks.
• Chocolate - energy dense food keeps people warm. Chocolate is easily digested, needs no preparation, and due to its fat content is more energy dense than pure sugar.^{[verification needed]}