Even if you're protected and prepared to the nines, if your house is on fire and your emergency kit is inside you're at the mercy of emergency personnel. And should you be trapped in your home after an earthquake your food and emergency reserves will be of no use.
Emergency preparedness personnel have so much as confirmed that average citizens will have no emergency assistance for a period of seven days after a major catastrophe. That's at least 7 liters of water per person, per day. There's absolutely no way that even well prepared families will have enough water, food and other necessities to withstand the after effects of a major earthquake in the middle of winter. Well prepared people will be relying on and expecting emergency services several days after an incident.
Well, almost any human can go weeks without food, so that's not the main priority. Water is.