You don't think a family of four buys 'food' ? I also get beer occasionally, although sometimes I get it from the corner store a few blocks away.
I do get kitty litter with the car on the occasional trip to Costco because I'm not set on using the bike for every last thing. Just that the eBike makes a lot of things a lot more convenient.
I can get three or four days of food for my family of four on my regular bike with no problem (I also have a cat). I live somewhere where I ride past half a dozen super markets on my regular commute, so stopping at the shop is no big inconvenience.
I do get kitty litter with the car on the occasional trip to Costco because I'm not set on using the bike for every last thing. Just that the eBike makes a lot of things a lot more convenient.