There should be different real life plants which can be used for different recipes. There should be a nutrient system that you need to eat different things not just watermelones as example and if you cook something it has the biggest effect.
These plants should have a different rarity. Some grow in big groupes, some in small and some grow for their own.
You have different recipes to heal, cure illness and for eating. The more rare a plant is, the more strong is it. If you drink dirty water which you havent cook before or raw meat or mouldy stuff, you should get ill: The effect of illness: You loose health more and more and your sprinting gets slower and slower.
Water should be also different purity, the water which is more rar like small springs should have a good purity, but the the best one has water from a well.
Please add more real life plants which you can use and some bigger and smaller rocks and rock groupes and mushrooms.