Super useful comment. R.e. toilet paper, random observation: buy a bidet and you basically won't need to buy tp very much any more. They are very inexpensive at least in the states. You can get one for $20 or so.
Yep, we have a backup supply. That said if there's no running water for a prolonged period we are eventually going to start having other problems. Fwiw I don't think that is an anticipated outcome even of a global covid-19 pandemic.