Sustenance

At the start, your civilization will find it difficult to secure sustenance, but with time and technological advancement this need will become easier to meet.

Ancient Era
Your civilization begins as a hunter-gatherer society. You may fish and gather food from plants, and even plant and evolve crops. You may not fertilize or graft plants.

You may not make quick meals, or food which you don't have all the ingredients for(if the food has no ingredients, such as grilled cheese, it's okay to make). Since you will only start with a campfire, this means you're limited to grilling fish for your cooked meals.

Classical Era
You may now purchase the stove and fridge. However, you may not store leftovers in the fridge, only produce and fish.

Technologies
Ancient technologies that improve sustenance:
 * Trapping