I agree with what the others have said, Rachel take note of what NR says, he's been at it longer than anyone else and he (usually) makes sense!
start with the food and water, start with enough SPARE food for a week, then a fortnight, then a month, then 3 months, we were snowed in a couple of years ago and I couldn't get the car out for nearly 4 weeks! don't go mad, just buy a few extra tins each time you go shopping, store what you eat-eat what you store and rotate, rotate,rotate-put the new tins at the back of the cupboard and bring the old tins to the front-eat then first.
Some people that prefer to be alone arent anti-social they just have no time for drama, stupidity and false people.