If you don't understand the core differences between how to even buy shopping and the influence this has on how you live your life… it's not possible to explain that, actually yeah, it's possible to never do shopping by car, even to feed a whole family.
I am sorry, the sentence with the "buy shopping" does not make sense to me. I completely understand this arrangement, I grew up in the USSR, where people had been carrying a net bag in their pocket (advised several times in this thread), calling it "what-if" bag ("авоська") and just going to the store every day and getting whatever was sold there, thinking the idea to plan to buy the exact things you need is ridiculous.
If you don't understand the core differences between how to even buy shopping and the influence this has on how you live your life… it's not possible to explain that, actually yeah, it's possible to never do shopping by car, even to feed a whole family.