A good knife, dry clothes, a piece string and the sas handbook at least.
Why so little you ask? There will be a huge chance that you will have 2 leave your house and go into hiding. The country, mountains, woods etc. So you only take what you can carry. The rest can be found on route. So it may be best 2 have two different kits, home 'n' away so 2 speak. Try carring a bag of sugar for one mile and you will see what i mean.
And an Analogue CB. They are harder 2 track.