Heavy Rain Disaster: Stock up on Tens of Billions of Goods at the Beginning

On the third day after the heavy rain destroyed the world, Lu Ling'er woke up in the rental house. The system interface floats in front of you, and the survival points are only enough to exchange for three days of food. Suddenly, a shrill scream came from upstairs - "Help! My daughter is still inside!" The system prompt flashes: [Rescue neighbor mother and daughter, reward 50 survival points; no penalty for refusal] She held the fire ax tightly and saw Aunt Zhang across the door through the peephole, scratching the iron door frantically with her nails. Her eyeballs were cloudy and black blood was flowing from the corner of her mouth. Save? May die. Don't want to save? 50 Points can give her half a month more life. The water level is rising at a rate of 5 centimeters per hour...