That's indeed the right solution. But it needs to be enforced by the stores - as many do now, with per-customer purchase limits.

> the recommendation has always been to have supplies for 10-14 days at home. Seems like a more reasonable number than a months worth - especially for city dwellers.

That's a nice recommendation for a calm time, but a bit short for the pandemic. If you get quarantined, you need to stay put for 14-21 days. Add a bit of padding to account for undersupplied stores (and to add a margin for error), and you arrive at 1 month's worth.

We've seen this coming since at least early February. That's exactly when I started stocking up, buying ~2x amounts of non-perishables (e.g. 2 packages of pasta) instead of waiting for the impending hoarder shitstorm at the very last minute. I forget where I read this recommendation (WHO?), but it has definitely paid off, I haven't been to the store in almost 2 weeks :)

That assumes you have absolutely zero access to groceries for those 14-21 days. But there are still delivery services and neighbors. In Germany, city governments have actually delivered food to those quarantined.

I'd say that's a safe assumption to make. On top of that, even contactless delivery by via service or neighbour has nonzero risk of communicating the disease (in either direction), so it's worth minimizing the need for it.

Interesting. Here in Norway the recommendation has been to keep supplies for 3 days, including water, power supplies (battery banks), a radio with full batteries, heating and cooking possibilities and so on.