i would purchase large areas of land in the most suited place for growing food which contains lots of woodlands. I who have a large house build with underground bunkers and all door in house are renenfored and windows are unbreakble and steel grates over. An wind, solar, hydro and geothermal power. Metal smelting plants + forge (not to big). Land for bio diesel crops. Extremly large protetion fence around the land. Vast store of food, weopons, tools. Get many people to join and run the place. Many livestock ect. The people there have to run the place living on whats there once establised. Pay works that will keep traditional crafts going. And make sure that everyone in the place is armed incase of the army trying to take it. Worst case have it set up so it can be destryed if you have to bug out so that they cant get hold of it. But make it big enough so ity can hold many 1000s of people there and produce everything to live.
Tractor, my own (owned) croft, livestock, trusted labourers (hey, getting auld y`know....)
Range Rover (I know, buying into the advertising.... ) and oh, heaps of stuff really.
Enough `techy thingies` to be able to live totally off grid.
No fallout shelters etc, just enough land and fencing to be able to tell the government/unwanted visitors to sod off.
Want to to know something really sad? I actually have detailed plans for my mansion, drawn up fully in chief architect, including underground complex, laboratories (I'm a scientist), fuel storage etc. The house above is quite impressive too, with hidden defences etc.
So, when I win the Euro lottery, I'll be all ready to get started!
I was very bored during one of my contract jobs a few years ago...