Without Air, you die in three minutes
Without Shelter, you die in three hours in the cold
Without Water, you die in three days
Without Food, you die in three weeks.
I would get a storage of water but remember it is only good for a while and has to be replaced. I keep like 2 gallons per person in our house as an initial store of water and maybe a case or two. It is a poor amount if something goes bad with the water supply but we ration to about half a gallon a day. You also have water in weird places in a dwelling that folks do not think about but if it was do or die you'd do it or croak. The pipes have a supply of water, the toilet tanks and hot water heater, ice in the fridge, etc. that could be tapped that most people do not even think to use. My amount is slow, but I am not a survivalist, just ex military and believe in a little prepartion. I would get a LIFESTRAW WATER FILTER if I was you. That way you can use water that isn't pure like ground water or rain barrel water.
http://www.amazon.com/LifeStraw-LSPHF017-Personal-Water-Filter/dp/B006QF3TW4Shelter, you probably have a place, so I will not touch on that. I would get a good survival manual like the US Army Survival Manual: FM 21-7. That is where I learned a lot of what I know. Very handy if your in the states. I know how to make a lean-to to last as a result of this book.
http://www.amazon.com/US-Army-Survival-Manual-21-76/dp/0967512395Food you need, I keep a lot of canned goods and storable dry food like oats. I have ate of lot of MREs in the US ARMY. I do not have a the fancy packaged meals like this
http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Dsporting&field-keywords=survival+foodI have some of my Army gear, like a backpack, poncho and cold weather gear that I have acquired as well as canteens etc. ARMY NAVY Stores are a gold mine in this regard.
I have some weapons but I like simple ones, like revolvers, pump actions and bolt actions as their actions are more dependent than autoloaders. They don't jam and if your a good shot as I am it only takes one shot to down your foe. I have a Ruger GP 100 .357 Mag with a six inch barrel. Rugers are over engineered and they are touch and reliable and it also shoots .38's . I also have a Remington 870 shotgun and a few others but those would be the two I would grab if my life depended on it. I load the shotgun with some a mix of slugs and buckshot like this buckshot-slug-buckshot-slug-slug in that order. Buckshot spreads out and slug will knock down whatever it hits. I use a mix because it affords me some flexibility should combat arise. My whole family can shoot decent and I have trained them, not only for survival but for home defense, I have lived in bear country and it was a necessity. I would get a good knife or perhaps one of these
http://www.amazon.com/Cold-Steel-97GMS-Gladius-Machete/dp/B004MMS0PE/ref=sr_1_sc_1?s=sporting-goods&ie=UTF8&qid=1408278626&sr=1-1-spell&keywords=coldsteer+macheteI got one for my son, he loves shows like the Walking dead. It would be a good advantage over a knife in a fight, and could be used as a tool as well. Do not carry it around as it would most likely violate most statutes. Ammo would be important too, or buy a gun in a common size as I did. .22 is common and cheap but not much stopping power, 9mm would be a safe bet, and .38s are still pretty common and the 12 gauge shotgun. Sadly most falter in combat so your best bet is always to avoid it, although everyone seems to think they will do well, it is against most people's human nature to kill another person or place self at risk. See this book if you do not believe me or have not seen it as I have personally.
http://www.amazon.com/Face-Battle-Study-Agincourt-Waterloo/dp/0140048979/ref=sr_1_1?s=books&ie=UTF8&qid=undefined&sr=1-1&keywords=face+of+battle+keeganMake sure you in shape as well. Poorly conditioned folks are not assets when your ranging about. Get a good first aid kit as well and backup glasses, meds if you need them.
I am not a prepper only a veteran and I am woefully unprepared but I do not lack some knowledge because of military training that I have had and penchant for reading and camping out. I would try to get to our family farm though if all went south. We have loads of livestock there and I think your could trust your family more than others in a crisis. But I generally trust the government to be able to respond having worked first hand with FEMA a few times as a civilian coordinating resources.
This website will get you started, all the info you need is out there on the web, you will not survive long if you totally rely on others, as you did in your OP post request.
http://www.family-survival-planning.com/food-storage-basics.html