Well i will stick only to the food issue. But mu advise will go for frost areas too.
So the best foods for this areas are the ones that replace humidity too. I prefer the aloe soups, but if you are low level for stove, the steaks from yogs religion works the same too. This foods replace fully your hanger bar and a small amount of your humidity. But they have no temperature effects so…
For volcano you will carry with you ice. It works fantastic cooling you down and you will have no problem inside all the volcano even almost naked.
For the frost temple you need any spiced food, still because you loose humidity fast, fix and take some berry pulp too. Berry pulp replace your humidity without cooling you down.
Thats all mine, good game