Hard to prep without any money.
Actually, the most important preps of all require little or no money.
Becoming more physically fit is as free as modifying eating and exercise habits. There is nothing more important to preparedness than health.
Gaining certain basic skills may be very low cost (e.g. welding).
Learning and planning are free. Knowledge is power!
It's surprisingly easy with just a little money. A 20 pound sack of rice has enough calories to feed one person for 16 days, and it costs about $10. Add in ten assorted cans of stuff to stir in (condensed soup, or similar) at about $1 a can on sale, and you can feed a family of four for a week on $20, and it stores for several years. Do the same thing with 20 pounds of spaghetti (another $20) and 20 cans of sauce (yet another $20), and you now have two weeks of food for a family of four at a total cost of $60. Similar bulk purchases of starch, canned chicken/Spam/tuna, and similar long-storage items when they are on sale can gradually stretch that emergency prep for a few weeks into an emergency prep that will last a long time. Two more details would be filling empty 2 liter soda bottles with tap water and a few drops of bleach each (details on line) and lining your basement/attic with them, so you have some emergency water, and having an ammo can stove that will burn almost anything flammable and boil water for the rice and pasta.
Most of my preps are cheap, and they actually save money because I'll buy 50 cans, packages, or pounds of whatever is on sale and then eat it over the course of a year, instead of buying the same things at full price when I actually want them. Extra ammunition isn't cheap, although a few boxes of .22 long rifle don't cost much and go a long way. Anyways, that's my thoughts. Your experience may be very different.
Also, from your handle, you already have a HIGHLY barterable skill for "post-SHiFT".
You’ve got enough money.
$17 for 50 lbs rice or bread flour.
That, a water filter/purifier, and my tagline will get you well started.