We usually have food to last at least a few months without restocking. Not because of the risk of a zombie apocalypse, but because we buy a lot when something is cheap. That saves both money and time. The corona pandemic has made us think of what we might need to add in case we have to quarantine ourselves for a few weeks. Most people will likely get the virus, but just a few will be very sick. Some won't even notice they have it.
Medication and vitamins can be vital. Pain killers and something for sore throats, which are the main symptoms of Corona.
Lots to drink, unless you are okay with drinking water. A carbonator (like Sodastream) can make water taste a little more interesting.
Handkerchiefs, toilet paper, and kitchen towels. You don't want to have to get by without those.
Amusements and pastimes. If you are not used to being at home for more extended periods, you may have to think of ways to keep yourself and the family distracted—both with and without the internet. A pack of white printer paper and pencils are cheap and can be used for many things, like drawing, playing games, writing, making lists, constructing paper planes, and so on. Pick up an old or new hobby.
A live connection to the world around you, for instance, a battery or dynamo drove radio. Listen to music, talk shows, news, and other programs to stay sane if you spend extended time alone. Talk to friends and family on the phone. Chat online.
How have you prepared for Corona? What would you add that might not be obvious to everyone?