What should I pack? What did you wish you brought?

I know this sounds trivial but I like to know that I'm prepared. I've heard that I should eat more protein, drink less soda, take vitamins, deep breathing, exercise, etc. My question has to do with what to bring. What were you glad you brought? What were you laying there wishing you had done? Also, were there any things that you did to handle your business? I've considered writing a letter to my son and other loved ones, just in case. Any hints on this?

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