American Blackout: American Blackout Panel: Informed Population
The expert panel agrees that in the midst of a crisis, an informed population is much more likely to be a non-violent one.
What a lot of ivory tower B.S. 72 hours? It depends on the extent of the problem. 72 hours is 3 days. "American Blackout" was over 10 days. If you're out of water after 3 days, you risk death fairly quickly.
Information after the event is insufficient. Being informed, and taking action, on preparing BEFORE the event is key.
A lot of useful information is available for free on the Internet (for example, military survival manuals). Download it; print it (paper needs no electricity to work), READ it. Get the books if it is more practical. ACT on the information to be PREPARED. Get a first aid course. Learn how to garden (and have one even if you have to abandon it to save yourself). Figure a way to leave if the roads are blocked without going through 'problem' areas. Etc. etc. etc.