That's an easy one - I live in the US.
I've very interested in the lacto-fermentation preserving Mark mentions and need to study up on that.
So you have even less excuses when there's a beautiful Nth American bush food book like this
[LINK]...!
On lacto-fermentation, check out the Korean Natural Farmer, Chris Trump (no relation!) in Hawaii. While his methods are for fertiliser, they can be applied to preservation and vinegar production as well. E.g. Lactic Acid Bacterium extraction methods
[LINK].
Now to get back on the topic of survival foods, I wouldnt trust my balcony production to be my salvation. Instead, these would be my survival foods:
1. Lomandra grains. 10,000 of these plants in my local area.
2. Gymea lily tubers. Also hundreds of these in my local area.
3. Edible weeds, esp. sow thistle, plantain, dandelion, blackberry nightshade, wild lettuce, chickweed and Inca berries.
4. Eels and waterfowl in a nearby waterway.
5. Wattleseed.
6. Mangrove fruit starch (requires detoxification prep, but they're there)
7. Casurina seed (one hell of a bother to extract, but heaps of em). Also great firewood.
If it was a true apocalypse scenario, I'd eventually convert our level 3 podium garden into a patch for some seeds Ive collected: pumpkins, persimmon trees, mandarins, cherry tomatoes, lettuce, cabbage, Korean melons.