For those in Hurricane Sandy's evacuation areas, please read Eli's post above. Or better yet, don't read it. Just leave, now.
For everyone else, regardless of where you live on the planet, get emergency kits. People who will have to ride out Sandy in place won't benefit from this 2010 repost, but it's a reminder to the rest of us:
- Water in plastic jugs, 3 gallons/person
- Iodine water-purification pills in case water goes bad (after 6 months, assume it's bad), in case it's leaked away, or in case you need more water (UPDATE: chlorine tabs have been suggested as lasting longer in storage than iodine)
- Mountain House 72-Hour Emergency Meal Kit, 1 per person
- Mountain Oven Flameless Heating Kit: each kit can be used 5 times and can prepare 2 meals at a time. So 2 kits per two people in a household, but also 2 kits in a single-person household.
- Plastic silverware
- Emergency phone numbers/contact list
- Cheap flashlight/headlamp
- Spare batteries in clear plastic bag so you can see if they've become corroded over time
- Plastic tarp and cord as a rain shelter
- Swiss Army knife
- Emergency shelter, 1 per 2 people
- Cheap or expensive first aid kit (I went with cheap kits from the local drugstore)
- Cheap rain gear, spare shoes and clothes
- Half-liter water bottle (enough to keep you hydrated for a few hours until you can find a water source. Keep more than one if you have kids.)
- Iodine (can disinfect murky water from ditches, and you might need to) (or chlorine tabs)
- Emergency shelter
- Small amount of long-lasting food (I found tins of honey-roasted peanuts that were good for four years)
- Cheap rain poncho (I didn't include this, but should have)
- Emergency contact list
- Shoes you can walk many miles in, if that's not what you normally wear
- Cheap, tiny flashlight
UPDATE: lots of great comments below, and a resource link at Making Light.