Start with the basics and build from there.  Check thrift shops for simple cookware, utensils, & daypacks.  Keep them filled with the proper equipment so you can grab them if you need to run.  You just don?t need state-of-the-art.  If you don?t have drinking water, you?d take water from a garden hose or dipped out of the toilet tank, wouldn?t you?  
Shelter ?  stretch a decent rope between two trees or posts, hang a large tarp over it for a tent, a smaller tarp for a floor, regular blankets and a few mylar emergency blankets.
Water -  Cheap & easy.  Keep a sheet of heavy plastic & more rope handy, plus a new plastic garbage can.  Clothespin the end of a tarp to the stretched rope (in the open), drape it into the garbage can to collect rainwater.
Medicine ? Most of what you need, you?ve already got.  Just put it together.
Food - When you go grocery shopping (esp sales), buy extra when you can.  Under stressful conditions, you?ll want familiar food.
Toilet -  Get a $10 toilet seat that clips onto a standard 5-gal bucket from a camping supply place.  Store a good supply of toilet paper in the bucket.
Cooking ? Make a few soda can stoves & buy denatured alcohol for fuel.  Put all your cooking stuff in a backpack (etc).  Add acan opener, matches, cheap lighters, & a magfire from Martin Focazio when you can  <img src="/images/graemlins/smile.gif" alt="" />.  If you normally keep meat in your freezer, have a way to cook it, like charcoal briquettes & a cheapo BBQ.
Toilet articles ? Have a bag handy with soap, shampoo, toothbrushes & paste, sanitary protection for the ladies, some towels & washcloths, & a couple of big packs of wet wipes.
Copies of important documents ? Keep them all together in one container.  If you?ve got irreplaceable photographs, keep them handy, too, as well as a copy of your personal phone book.
You can set up camp in your own back yard.  You can run with all this stuff if you have to, and set up a camp in a friend?s backyard.
Take it all to a campground with your family and make notes of what you forgot.
Sue