Haven't given much thought to this in the past, but in terms of weapons I have a friend who has a few katana that could be sharpened and then used. As for getting guns I believe I should be able to get to Fort William in a few hours by road. It being an active military base should be defendable and contain some useful weapons.
In the long term, a boat or oilrig would be the best way to survive. (Or maybe a blimp)