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Most raw ingredients (wheat, coffee beans, cacao, pumpkin seeds, and more)
are gathered by foraging rather than bought. Foraging itself is unlocked
in Crafters Forge — the same mountain that unlocks crafting, taught by
Zorryn in an Overgrown Garden. See
How to Unlock Crafting for how to find
the entrance and every skill taught there. Once learned, different
ingredients turn up in different sectors (jungle, green mountain, pastures,
and so on), and 'forage survey' will tell you what a room can turn up once
the skill is advanced enough.
Some ingredients aren't foraged at all — milk comes from milking a cow or goat, and a few others are the product of another cooking activity (flour, ground pepper, yeast, butter) and have to be made properly rather than found.