I've never used Doordash or any other delivery service (local pizza place that offers delivery aside), so I suppose the same exact way I live now? The few people I know personally who don't have the ability to do their own shopping have relatives who shop for them, since family is free.

When I used to work at a grocery store out of high school, back before there were services people could use to do their shopping for them, I recall a few elderly regulars who would be driven to the store by their local community transport once a week or so, and they'd just hand one of us their shopping list. They'd pay, we'd load their groceries into the transport van, and they'd get driven home where presumably the driver would help them unload.

On the one hand, seems unnecessary to force someone out of the home to get driven to a store where someone else does their shopping for them anyways, but that was back when paying by cash or check was the norm (hard to trust a stranger with a large amount of cash or a blank check). Delivery services simplify that at least, but I'm hoping they don't have to pay more for that today than they used to, since we at least used to do the shopping part for them for free (not sure how much they were paying for the transport though).