oxygen, water, food, sleep, and enough clothing and/or shelter to
prevent death from exposure. As far as survival is concerned,
everything else is optional.
Now that I've answered the question literally, let me answer in the
spirit of the question. Here are the things I need to function well
and be content:
Information: I like to consume a steady stream of information, be
it from RSS feeds, books, newspapers, magazines, or conversations
with intelligent people.
Exercise: I need to be able to move around and burn off energy. I
don't like sitting still for too long.
Nature: I like being outside. I like looking at animals and finding
interesting plants. If I go too long without sunlight, I am not
Games: I like playing strategy games that test a variety of skills.
It is exercise for my brain, and tends to be a great way to spend
time with friends.
Quiet Time: I do not like chaotic, noisy and busy environments; I
need to be able to relax in a low-stress, comfortable place for at
least some of the day.
Healthy Food: I need my veggies and whole grains to feel my best.