There's two elements of prep work that anybody can and should do: 1. The cheap stuff that you may never use, but if you don't, isn't that big a deal: First aid kits, a supply of disinfectant, masks if it isn't already too late for that, etc. 2. Stuff you're going to buy anyhow, like canned food you already use, stuff you can easily freeze in advance without it being too big a deal, etc., that, again, you would have used anyhow. This is just pulling purchases forward rather than spending new money.

After all, just because COVID-19 may in fact end up contained doesn't mean you're not going to be in a serious earthquake next week or something. Having this stuff widely distributed greatly increases the resiliency of society against all sorts of issues, means you'll be one less person draining valuable resources in case of some disaster, etc. Being at least a bit prepped is the socially responsible thing to do.

Also, don't forget some of the specialized things for an extended in-home stay, which a lot of prep lists don't necessarily focus on (as a lot of them are assuming the problem is that you don't have a home anymore): Toilet paper, paper towels, salt & spices, etc. Anything you don't want to have to suddenly run out and get.