Working in earth quake country (Seattle) but living about 35 miles south I always keep a backpack kit with trama first aid, socks, water, food, ammo, fire and light stuff as well as dust masks and gloves, tools, space blankets, water pills and filter like the Capt's and such. Most likely I will have to walk home when the roads are inpassable after a real good quake
I figure about a day and a half to make it home where the real stuff is but should be more than enough to get me there.