Authorities across Europe, Japan and Taiwan advise households to maintain emergency supplies: European Union: at least 72 hours.
Germany: at least 3 days, ideally 10 days.
Sweden and Estonia: at least a week.
Latvia: 72 hours, preferably a week.
Ireland: No fixed duration.
UK: 3 days.
Norway: one week.
Switzerland: 1 week of food and 3 days of water.
Japan: At least 3 days, ideally 1 week.
Taiwan: At least 7 days.
The guidance covers extreme weather, power outages, cyber attacks, supply disruptions and armed conflict. None of the official sources consulted indicate an imminent threat.