I'm going to skip over things like water and food, assuming those are sort of the same for everybody. I'm not sure I can get to 10 otherwise, though. So I'm not going for literal survival, but rather maintaining my current level of desire and comfort.

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1. Books.
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2. Pocket computer.
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This is misleading. I could actually live without this quite easily. Have done so at times while enjoying a weekend in a consciously-chosen off-the-grid place. I'm including it to mean an item I could not live without and still maintain the ease and connection I have have now, not in in a survival sort of way.