We have a pretty good thread on here discussing survivalism/prepping. I'd say start there, and my personal favorite prepping channel is Canadian Prepper. Admittedly I've purchased stuff from Amazon, but trying to give them the least amount of business possible. Not only does he have his own store, but also tries out the gear, gives reasonable expectations, etc.
It's one thing to know what to buy, but more difficult to get good gear/know which brand. I bought a "survival shovel" for example one time and when it arrived I realized it was garbage.
But as always, hit the basics and try to keep it under 30 pounds. If you really have to bug out, and can't use your vehicle, then consider having bicycles if you don't already have them.
For food think lightweight like freeze dried mountain house, but also granola bars when you don't have time to prepare something.
Water filters -- I like the Survivor Filter. Much better protection than say the popular Life Straw.
Shelter/warmth. (multiple ways to start a fire)
Baby wipes and other sanitation.
Survival knowledge book. (SAS survival guide specifically)
This is all just scratching the surface -- so many other little things to consider like two way radios, binoculars, compass, and other items can be useful.
Just keep in mind, bugging in is the best bet. Bug out when things are insurmountable, and make sure you have a location you're bugging out to.