Just take baby steps. Try to get out of the city eventually or even to a small lot in town that has some sun exposure and some space for some raised beds. In the meantime see if there’s any borrowable growing space and a reliable alternate water source you could use in your immediate area to do a couple raised beds or a small community coop plot. Even start on your balcony if you must.
Firearms aren’t a must, and if you haven’t been raised in a culture where you’ve had lots of exposure to them, you need safety training. Maybe someday you will be be able to move to a jurisdiction that permits their use as tools for gathering food, if not for self defence. In the meantime, improvise, take a safety course on firearms and explore legal options. Learn about 3D printed options. But weigh risks with the laws in your country. You can’t be much of a provider behind bars. In the meantime make yourself the weapon. Train Jiu Jitsu and get your kids and wife into it. It’s literally the best thing you can expose a young person too for lifetime confidence, fitness, and practical self-defense.
If you have kids, a good way to introduce libertarian ideas into the home in the background that everybody in earshot will absorb is to watch the Tuttle Twins series on Angel Studios. It’s a cartoon series aimed at kids that talks about concepts of freedom, liberty, and sound money.
Baby steps.