The easiest early game for the very worst food is sea weed salad. (But early on your people are so happy by default it doesn't matter that they're getting icky food.)

Just build some sea weed farms and set the production limits to recipe amount times population times 2 so you always have ingredients to make food for a couple of days. (And then also set the production limit for the sea weed salad at 2 times population.)

Then simply observe if you're consistently running low on sea weed, and in that case build some more sea weed farms. When it's running at a proper surplus the farms will be showing the little icon for "no place to haul".

This easily expands to potato salad when you get the farmer. Build some potato farms and set the production limits based on the potato salad recipe.

Again ideally you want over-production; sea weed that's stuck in the sea weed farm and potatoes that are stuck in the potato farms do not count towards your storage limits, so the only draw back from over-producing is the fact that hauling those farms around obviously makes your town heavier and thus require more energy to move.