It surprised me that nobody listed a medical kit in their top choices. Playing for realism, I kitted out my survivor the way I would try to IRL. I wouldn't go anywhere without a med kit handy and/or without some utility tool.
Being 2 days in, I think I've decided to just go back and maximize the amount of ammunition I can get from the prologue bunker, then use my heavy weapons more often. (Though we may still be able to discuss a trade, when and if PvP trading is allowed.)