We can just assume that the shelves will be stocked, the lights will be on, and we'll be able to pretty much do all our shopping in one spot.
The problem is, even in industrial and affluent society like mine, these services can be disrupted but simple things. Power outages of more than a few hours tends to make supermarkets cull their perishable stock (pay attention, urban scavengers, you might be able to pick up a truckload of just-begin-to-thaw frozen goods).
Imagine what fuel shortages, road closures, quarantines or other long time disruption to supply chains would do.
My local supermarket is a marvel of modern convenience, is only 650m from my house. Easy walking distance for a bottle of juice, or a bag of chips, and we even drive when we do a big shop. How would it fare in the event of a disaster? How long would it take to empty of supplies? How long would it hold up if locked down?
It gives me pause for thought, perhaps it might for you too.
I certainly have a mental list of "what to grab in the first few days of an event" which I will write up and share shortly.