I have a 3 day kit in my vehicle and a BOB that is essentially a 3 day kit with one day of water. However, I have a larger cache of supplies at home for inplace sheltering that should last 4 people two weeks.

Even my 3 day kit in my vehicle can easily be stretched longer but only has 3 days (for 2 people) worth of food and water. I choose 3 days because it is a resonably portable amount of supplies and I can expect to be rescued anywhere in AZ in 3 days or less should I become stranded in with my vehicle or I need to make it back to one of my caches of supplies.

Stocking the house for two weeks was actually easier then I initally thought it would be. Although in the event where I would need the supplies, I will probably be at work

As martinfocazio noted... water and fuel are the key ingrediants in any home or vehicle survival kit! Fuel for cooking, generators and vehicles. Remember to maintain and start generators weekly.