"Have enough to survive" means you and your dependents and whoever you plan to hole up with will be able to survive the loss of electricity, food source (e.g. stores are or have been looted), water, and law enforcement. Let's assume average temperature for your area.
There are no right or wrong answers nor do you have to justify yourself. Your answer should be based on how long you think you can hold out along with everyone else with you. You are not confined to your domicile. If your plan is to live out of your car, boat, or camping ground, those count, too.