Anyway, the canteen building is where food can be stored, prepared and consumed and will act as a socialising area too. Raw foods can be placed into a food cupboard (and later a fridge) and at some time later, these foods can be prepared into what I'm calling a "Prepared meal". Colonist will enjoy eating a prepared meal over just eating anything edible in the food cupboard. Eg. They prefer to eat a deluxe pizza rather than raw tomatoes and cheese. Up until this point, they've been eating apples and tomatoes in the warehouse.
I've also added temperature and seasons recently, this can add to the realism a bit too, so a tank of water left outside will stay around the ambient outdoor temperature, which means it COULD freeze over winter, and over summer the colonists won't like drinking warmish water, they'd much prefer a cold beer. There's a special tank for that, that uses electric to cool or heat the liquid contents.
It really is one of the main things developing in the game,
1. keep the colonists alive.
2. find ways to make and keep them happy.
3. Don't grow your colony too fast or you might run out of resources for them to consume!