>"Please keep 3 days of food and water MINIMUM in case of unforseen tragedy"
Red Cross recommendation, which nearly every civil protection service on the planet refers to, are way above that.
3 day food and water are their recommendation for EVACUATION supplies.
Not in household supplies.
In household supplies it's 2 fucking weeks of food minimum.
Most government on the planet just assume people have TWO WEEKS of food in their home.
Emergency services will first and foremost focus on water supplies (be it fixing an existing network or shipping it), they will not start to think about food (outside baby food) until the time it might become problematic AKA 2 weeks (as people won't die from starvation even if they go 2 weeks without eating as long as they have water. Starvation ISN'T FUN). In a condition were roads loads are limited and you suddenly have to ship 1 gallon of water per person per day, water typically takes all the logistic place available.
If you're hit by the most common disasters, shit weather related (flood/terrain slide/storm), the government almost never issue evacuation notices (because looting, riots, etc) outside of the worst of it.
They do the opposite and ask people to stay at home… Because they assume people have the supplies for it!
Now sure having a bunker in the mountains is another story, but the fact is most people don't have the supplies the fucking GOVERNMENT tells you to have because that's what THEY plan their emergency relief efforts around.
And before you go "2 weeks is a lot, they will have fixed things in a couple of days", sure… but I have personally see one (storm + rockslides) that cutoff tens of thousands of people for… 6 months.
Yes in continental France.
Had this shit happen in tourist season it would have been HUNDREDS of thousands of people.
Because once a main roads is gone, as in a couple kilometers (total) fell of a cliff (in several places) and took the cables with them and the ground is still unstable as fuck… it doesn't get fixed by snapping your fingers.
It takes a couple of days for the emergency generators and water to be airlifted in, 5 or 6 to (temporary) fix the power lines (note that was before EDF turned into a for profit private entity, today it wouldn't be that fast), 10 days for the government to manage to get a proper supply train going (using the back roads… that they will close and reserve for their own usage) and months to do the heavy work needed to repair and get back to normal.