@Sgt.Tabbykatze
Or a bricked house, small or large stones, ect to grind the edges down.
Rocket is going for realism, and in real life you are going to do near anything to get a can open. Concrete/pavement is literally everywhere in real life and in game.

Did you guys even watch the video he posted. I've been thinking about this since I found out you needed a can opener/sharp object. I've opened a can in boy scouts on concrete without losing any food, why not make this an animation?

Please watch the video, this is real realism.

"If you drink enough and eat enough you can go from town to town for a long time. Its just not like in the mod. You need to eat more than once to be fully fed."

^ This, you have to eat more than just getting rid of the messages ([Thirsty] and [Hungry], you have to over eat and over drink to become [Healthy], but not too much too fast. When you become [Healthy], you go quite a while without losing hunger/thirst as long as you don't sprint 10+km