Agreed, you’d need a basic level of survival comfortability before you’d be willing to accept gold for some of your surplus food or water supply. Food and water would definitely be the most valuable resource there’s no doubt about that. Other things would still be traded other than food and water. If I had a surplus of pots for boiling water to make it drinkable, I’d trade that for gold so I could then turn around and trade that for some other tool that will make it easier for me to get my own food and water