In terms of food you should farm up what the swamp gives you before you get in to the crypts in order to play it safe.
So you want Muck Shake, Black soup and Sausages. Muck shake is easy to make that is your stamina at that level. Black soup is the only tricky one due to needing turnips.. but you need turnips for the food upgrade station to make any of them anyway so you should have them as well.