Su Yao continued her tense yet methodical stockpiling operation. Every new source of supplies was her battlefield, and she was determined to arm herself to the teeth for the battle for survival in the apocalypse.

She arrived at a specialized tool rental shop, where some large and expensive tools, rarely seen by customers, were treasures in Su Yao's eyes. She set her sights on a small air compressor, a device that could be invaluable in situations requiring pneumatic tools, such as inflating tires or operating pneumatic wrenches. To complement it, she also selected some other pneumatic tools, such as a pneumatic nail gun. When reinforcing the shelter, a pneumatic nail gun would be many times faster than manually hammering nails, significantly improving efficiency.

Next was a small welding machine. Although it required some skill to operate, in the apocalypse, a welding machine was indispensable, whether for repairing damaged metal fences or building simple defensive structures. She also purchased enough welding rods and protective masks to ensure safety when using the welding machine.

Firefighting equipment was also on Su Yao's list. She bought a large number of fire extinguishers from a fire equipment store; different types of fire extinguishers are suitable for different types of fires. Dry powder fire extinguishers can deal with ordinary flammable material fires, while carbon dioxide fire extinguishers are used to extinguish electrical fires, etc. She also selected some fire blankets, these lightweight fire-fighting tools can quickly extinguish flames in emergencies, or be draped over oneself to block fires during escape. She also added a fire axe to her collection; this sturdy axe can not only be used to break through obstacles in fires, but also serves as a powerful weapon when facing zombies or other dangers.

At a junkyard, Su Yao found some unexpected treasures. She discovered some discarded solar water heaters; although old, after repair and modification, some parts could be used in her already purchased solar power system. She also found some thick metal plates, which could be used to reinforce the walls and doors of the shelter, increasing its defensive capabilities. She picked out some old car seats, which could be modified and placed inside the shelter to provide relatively comfortable resting places.

Su Yao didn't neglect agricultural supplies. Besides the seeds she'd already bought, she went to an agricultural supply store and purchased more fertilizer and pesticides. While minimizing the use of chemicals is ideal in the apocalypse, appropriate amounts of fertilizer and pesticides are necessary in the early stages to ensure crop yields. She also selected some manual irrigation equipment, such as small pumps and sprinklers. These devices can utilize nearby water sources, such as rivers or rainwater harvesting ponds, to provide moisture for the crops.

To better store food, Su Yao purchased a large number of airtight containers and desiccant boxes from a storage equipment store. These airtight containers can be used to store grains, dried goods, and other food items, effectively preventing moisture and pests. The desiccant boxes can be used to store humidity-sensitive items such as medicines and electronic devices. She also selected some shelves and neatly arranged the containers and boxes for easy management and retrieval.

At a music store, Su Yao bought some simple instruments, such as a harmonica and a ukulele. She knew that music had a unique role in relieving stress. In the oppressive and tense environment of the apocalypse, simple music could bring people a sense of comfort and help them maintain mental health. She also bought some painting tools, such as drawing boards and paints, encouraging everyone to express their emotions through art in their spare time.

Su Yao then went to a secondhand furniture market, where she selected some sturdy wooden wardrobes and cabinets. These wardrobes and cabinets, after being modified, could serve as additional storage space for clothes, tools, and other items. She also picked out some old tables and chairs, which could be used to create a simple living area within the shelter, providing everyone with a relatively normal living environment.

Su Yao had a new plan for energy reserves. She bought some methanol and ethanol from a chemical raw material store. These alcohols could serve as backup fuels, and could be used to run small engines with simple modifications when gasoline and diesel ran out. She also bought some materials to make a simple alcohol stove, which could be used for cooking and was a relatively safe and readily available cooking device.

At a building materials market, Su Yao purchased a large quantity of cement, sand, and bricks. These materials can be used to construct and reinforce the shelter, such as building stronger walls and repairing damaged building structures. She also selected some waterproof membrane and sealant to ensure the shelter has good waterproofing properties and prevent rainwater and groundwater seepage.

Meanwhile, Su Yao also purchased some waterproof document bags and file boxes to store important documents and materials, such as maps, survival guides, and family photos. These documents carry memories and hopes in the apocalypse, and may also contain information of vital value for survival.

Every resource was carefully considered by Su Yao. She was like a meticulously prepared general, stockpiling food and weapons for the impending apocalyptic war, leaving no detail overlooked that might improve her chances of survival.