Victor, your last point is kinda the point ... if you're gonna prepare, prepare for the worst case scenario. Don't plan for FEMA, National Guard, normalcy or anything to ever be the same. Cash will be useful only as paper. That's a real life scenario today in Chile, Haiti, parts of Asia, Africa ... I stockpile the means to make or acquire what I need indefinitely, over and above 30 days of consumables. I expect barter items will include knowledge (I.e. how to), tools, meds, skill, ammo.
Instead of paper plates I use a steel cup, which I've ate, drank, brewed coffee and shaved in alternatively for two trips to Iraq. Sand cleans it well if there's no water. I suspect those will be popular a few months in. Good useful knives. Rope or cord. Plastic sheeting. Crank lights or radios. Duct tape ... great bandage.
Water purification with bleach or tabs can harm you, especially if you're dehydrated. Filters are best, and you can build your own with a bucket and sand. So Id stock buckets, wire mesh in 1/2", 1/4", and 1/8".