I think countries should have power outage drills. Not sure what exactly they would look like but everyone should know:
• How do I get water & food (less urgent)?
• Can I still buy things? Can I get cash?
• What to do if I can’t flush my toilet? What to do about trash?
Related work:
• Offline payments: https://www.nmi.com/blog/offline-payments-an-important-backup-when-the-connection-drops/
• ATMs that work offline: https://www.riksbank.se/en-gb/payments--cash/payments-in-sweden/payments-report-2022/safety-and-efficiency/are-payments-in-sweden-safe/offline-payments-can-improve-resilience-to-disruption/
Follow
@light_bulbs
The invention you're thinking of is called cash.
One can use it and carry in something we call wallets.
