Remember preparedness/survivalism is not just about getting ready for doomsday. It is a journey of strength and independence. Which are really one and the same, independence is strength and anti fragile. Weakness the dependence and fragile. Obviously we must always be pragmatic about this, but so long as your chances of survival are increasing. Then you are winning.
Growing food is a simple way of adding quality to your life. Not only is it more cost efficient in the long run (if you do it right). The food is healthier and tastes better. Do you think the cheap food you buy at the market is going to be as good as home grown? The reason for the massive amount of diet related health problems is that people seem to expect a £1 ready meal to be some kind of al a carte dish.
You get what you pay for. Start a garden today, all you need is a vertical garden space (seen here). Just use pots to grow all your plants, no need to work the soil and rotate your soil to plants that will replenish it. This means your will not need to buy much soil. Add a home made compost system to never need to buy soil again.
I hope this picture gives you some inspiration. And leave a like for the poor snail eaten swede plant, I had to move him of the floor, poor thing.