Things you can physically hold and use - stocks and bonds would be useless, unless you can afford to hold them for 50 years....
Besides one or two solar generators, as I posted before. New 12 volt vehicle batteries to power lights, microwave and ?.
One of our younger relatives has some suggestions:
Sleeping bags that zip together, one light pair and one medium pair. Even in California, when the temps get down to freezing outside, you need some way to keep warm at night when you have no natural gas or electricity to heat your home.
Efficient electric Room fans that can circulate the air from one of your rechargeable 12 volt batteries with a power inverter.
High end portable water filter.
Water catchment systems to capture rainwater running off roofs for flushing and whatever or to get drinking/cooking water via your high end filter.
Good canned soups that don’t need water added and canned veggies/meats that can be added to the soups or eaten by them selves.
Carbs as crackers or high end cereal.
TP, facial tissue, paper or bamboo towels.
As much otc drugs like eye drops, steroid nasal sprays, anti histamines and ???? as you can afford and rotate the stock by buying new and storing it and use the oldest dated products.
First aid kits and supplies for the kits.
Once you have a 12 V storage battery capability take a look at USB lights and fans. In the past year or so there have been significant LED driver advances and more efficient small DC motors.
Here's a link to one of their fans I've used for more than a year...OPolar USB dual desk fan
Has a small foot print, easily stores, dual stack fans tilt and oscillate multi speed, very quiet w/10,000 mAh lithium batteries. Fit my sliding glass windows for exhaust and fresh air intake...all night long with power to spare...can operate on direct DC from wall adapter. They also have Great way to stretch available battery capacity.
Another big advantage is that with onboard rechargeable batteries the fans and light aren't tethered to inverter outlets or extension cords...move them as needed. USB 5V items are cheap and efficient now...even RV owners are moving away from 12 Volt small appliances. Get a high USB 3 12 volt adapter plug and some power banks for distributed wirpower.hortable power.