I had the same problem, until I realized It's basically like living in the country side, Just grow ur own crops, get eggs, milk and Theres a Option in your phone to Order a delivery, once clicked you will see groceries and stuff ... so yea!
I purposefully picked out the lot challenges "Simple Living" and "Off The Grid." But even if I have all the ingredients in my fridge and I click on the food for my sim to cook, they'll just put the ingredients on the counter and won't cook. I have a stove picked out that's functional off the grid. Every once in a while it'll work and my sims will cook, but, most of the time as I said they just put the ingredients down and won't do anything else. It's getting really annoying because ingredients are disappearing from the fridge, no food is really being made, and my sims are going to starve...
