According to the official government web site for New York City Emergency Management, New Yorkers should:

Go Bag

Everyone in your household should have a Go Bag — a collection of things you would want if you have to leave in a hurry. Your Go Bag should be sturdy and easy to carry, like a backpack or a small suitcase on wheels. You'll need to customize your Go Bag for your personal needs, but some of the important things you need in your Go Bag include:

Bottled water and nonperishable food, such as granola bars

Copies of your important documents in a waterproof container (e.g., insurance cards, Medicare/Medicaid cards, photo IDs, proof of address, marriage and birth certificates, copies of credit and ATM cards)

Flashlight, hand-crank or battery-operated AM/FM radio, and extra batteries