Walmart (perhaps not in every area) will do your shopping for you and you just drive, park in a special spot, and call them on your cell phone. They will bring your groceries out to you, if they have what you ordered. Pick up is free. http://walmart.com
Meijer also has a shopping program. I’m not sure how it works but you order online and go to the store to pick it up. https://www.meijer.com/services/more-ways-to-meijer.html
You can have Walgreen’s ship your medication to you but it might take 4 days on a good day, longer if more people at the USPS are sick. Or you can pay for 2 day shipping in some cases. NOTE: having Walgreen’s ship a med that was refilled at the store near you is NOT the same as going through an online pharmacy. Online pharmacies can take 4 weeks or more to get the meds to you for a new prescription. http://walgreens.com
Shipt.com can deliver groceries to your home. But you have to use a cell phone app to use the service. That means this will not work for nearly all seniors. There is a fee for this service. And you can specify alternative products in your order. You pay the Shipt prices, you will not see the store receipt. https://www.shipt.com/
