If internet isn't viable, I assume?
Well considering I've already spent months without human contact and barely noticed, I think I'd be okay going in by myself.
I already spend a large portion of my mental energy training myself to be perpetually happy regardless of circumstances, as well as other types of mental shaping and training. That is what would shape my perceptions of this event.
As such, I'd take whatever would give me a good balanced diet, with exercise, throughout the year. Exercise would be things like jump rope and free weights.
Anything for toiletry and smell reducing requirements, since hygiene won't matter too much beyond dental health. Antibiotics and such for basic health maintenance, especially considering exercise. Waste disposal in general would be nice, if possible. Lighting would be important, if not provided already. I've heard there's some efficient lighting out there.
Clothes don't seem necessary, depending on the temperature, though shoes could be important. A few sets of minimalistic bedding.
The other things would be backups in case of impending insanity. Simple entertainment like fiction books, decoration, porn, computer games (think DS games with a supply of batteries), stuff to draw with, puzzles, lego etc.
I imagine I would spend a huge amount of time writing my own books, introspecting, meditating, exercising, eating, reading non-fiction, and sleeping. Not too much else required.
I just psyched myself up for a fictional event
