I can speak from experience as Hurricane Irene put us out for ten days. A couple of crucial questions you need to ask yourself:
1. Do you have well or city water? If you have city, water will continue to run in your home. If you have well water, you will have to prepare to get water from other sources. Collecting rainwater in large buckets will help with things like flushing toilets, and bottled water will have to be used for teeth brushing and drinking.
2. Do you have a gas stove? If so, that can continue to run. Otherwise, purchasing a propane grill or charcoal grill will be a huge help.
3. What season is it? If it's summer, you have to keep cool- which is fairly simple to do with shade and water. However if it's winter, keeping warm will be a bit tricky. A propane heater, wool blankets, down sleeping bags can all help. Having a fireplace also is a plus.
4. Empty out your fridge and purchase as many non-perishables as you can. If you have access to a place that sells blocks of ice, purchase a couple in keep them in coolers. You can pick out chunks of ice to use in another cooler to keep perishables from spoiling.
5. Fill your car with gas, and use it sparingly. Gas stations will not be able to pump gas. You can even fill up extra gas ahead of time.
6. Charge your cell phone, and make sure you have a car charger. When you do decide to drive around, make your phone calls then.
Those are the ideas I have off the top of my head!!