I guess it all boils down to how one defines a PSK or even a BOB/72 hour kit.
Realistically speaking , I live in a mid sized city (Fresno) my chances of procuring any wild food were something cataclysmic to take place are nil , there are some 700,000 people in my area , not counting nearby mountain communities and smaller cities , that mass of people will be going apesh*t when the feces hits the fan and regular food runs out , anything on 4 legs or with fins will become breakfast lunch and dinner.
My PSK doesnt contain anything for food , in my case if it came down to it my PSK will hopefully help me get home to where my supplies and goodies are (my PSK = very basic 1st aid , light source and SAK) My BOB is more comprehensive but not unlike the PSK , the whole purpose of having dense calorie bars is a compact , easy to consume source of food. No heating or preparation required and little water needed to digest (of course you have to have water but the less you need for digestion purposes the more you can use for basic hydration). Of course the final choice is up to the individual and what meet/suit his or her needs.
IMHO one is far better off procuring book and knowledge on edbile plants in his/her area than to worry about fishing or hunting , that is living in a urban scene. There are dozens of "weeds" in all urban areas that one can eat and are quite nutritous , those will all be overlooked by the vast majority of people , of course if your situation is rural , the choice of edbile plant life expands dramatically , you could quite easily 'live off the land' if you know what to look for , all without time consuming fishing and hunting. Unless of course , all you have is time

Here is a link to many of the books that ocver this subject
http://www.thelivingweb.net/books_wildfoodandforaging.html
I have several old issues of American Survival Guide that cover this subject in depth.
If you search on the subject , you are liable to find articles on many urban edibles containing toxins , something else to take into consideration..