I'm wondering how realistic a water or power shutoff is, those seem like much bigger concerns for a hurricane or earthquake. For covid-19 it seems like the municipal authorities will be able to keep at least the handful of people working that are required to keep the grids up (even if just about everyone gets infected, it sounds like ~80% of cases only have minor symptoms).

Restaurants shutting down and grocery stores running low on food seems like a more likely scenario.

Regardless, I've now stocked up on 2 weeks of water and about the same of food. Which is a good idea anyway for earthquake preparedness, but something I'd never gotten around to actually doing. So I'm feeling a good balance of prepared but not too stressed about it.