living without fridge or food preparation

Hi.

Some time (read: 25 years) ago, I asked about a minimal diet for survival:

https://groups.google.com/g/rec.food.cooking/c/yNDNcy8v5B0/m/VpIYtj1S9W4J

I now have a new objective. I live in Sydney and have access
to a supermarket. But I want to see if I can survive without grid
electricity. Just portable solar. Basically emulating conditions
that might exist if I was backpacking in some jungle. I have 40W
solar panels that fit in a backpack. So does my laptop and
smartphone and powerbanks. Satellite communication is
portable and lightweight too. I only need to connect once/day
via UUCP to participate in newsgroups. I have actually been
sorting out the software side for decades (see https://pdos.org).
Solar electricity I have only taken an interest in in the last
couple of years when I was temporarily in the Philippines (and
experienced daily blackouts and once it was about 3 days).

Anyway, before, price was something I was interested in. Now
I'm not too worried about price. I'm interested in not having to
store food in a fridge, and not having to cook. I don't want to
spend time cooking (lazy), but also, I will (simulating) have no
electricity or gas to cook with anyway.

I would want food that I could stockpile for say a 3 month
supply. And I'm looking for something that could theoretically
be sustainable and healthy forever.

When I was in the Philippines they survived without electricity
after a blackout that lasted about 3 days, but people had
chickens and stuff. I didn't look too closely at the food supply.
My focus was on electricity - specifically to be able to continue
my programming work without electricity other than that I
could get from the Sun. And portable.

I don't want to maintain chickens either. Nor grow vegetables.
I live in a 2-bedroom unit.

What are my options within this new constraint?

I remember there was some "astronaut food". I don't know
if that was a real thing, but it could be as simple as buying
that.

Thanks. Paul.