Castaway and Glitzy

The visa application process for St Petersburg was quite a task - details and invitations - photos and proof, numbers, money and more numbers. The information was sent away with the promise that if everything was in order the visas would be sent within two weeks.
They came today - and very pretty they are, too.
Pasted in prettily, printed prettily and glitzy with a lovely shiny Russia sticker to herald its authenticity.
St Petersburg is pretty too. All beautiful buildings and scenery or so the brochures say. We may have a distinctly rosy impression of Russia for our two night stay.

Castaway showed the Tom Hanks character in agony with a troublesome tooth - the message left for any traveller to get the teeth done before any travel. Dentist appointment made and today was the day. Teeth are sorted and bless you Daniel Wong. Would hate to be cast away with dodgy teeth and no ice skate.

How does one prepare to be cast up on an isolated island for years and how should one pack and what could one expect to have washed up. What five things would be essential to have in the back pack in a deserted place.....

1. Knife of some sort (must pack Swiss Army knife and hope it is with me at the time)

2. Water bottle (with never-ending fresh water issuing forth)

3. Matches (unlikely they will be mine - they may have to belong to someone else)

4. Bear Grylls (to show me how to survive - but he can eat the bugs by himself)

5. A make up crew with Bear Grylls so I look okay when we have survived the harsh environment for a whole day - or even two.

All in all between St Petersburg and castaway it should be fairly glitzy.

What 5 things would you want with you on a deserted island?