Reborn in the end of the world, I scavenged in the empty city and bought for free

Heavy rain, floods, extreme cold, hail, poisonous fog, earthquakes, eternal night... all kinds of natural disasters that come one after another are like wild beasts devouring this blue planet. Once reborn and returned to two months before the end of the world, I got a portable space, which needed gold to upgrade. The problem is still that I am poor and my bank deposits are in danger. No money? It doesn't matter, the system auxiliary function is online, and you can get various bounties for completing tasks; grab this bonus to go shopping and stock up to deal with the upcoming natural disasters. The end of the world is coming, the space upgrade is suspended, and the system bounty is still running. Wait, this time the reward is changed to 50 kilograms of pork for completing C-level tasks, and the reward for B-level tasks is...