There's a foraging mechanic, the probability of getting lucky and getting more food is raised by learning the forager perk.
But it's not necessary, as you can just buy the required amount of food in any inn. It costs 10GP, so it's affordable.
You may also need some money, and it's not hard to earn them, for example you can get around 250 by doing odd jobs for Brothel or 300 by defeating Quetzal. See more on Tales of Androgyny wiki