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You and Lina woke up in an apocalyptic world. For unknown reasons, everyone except Guest and Lina disappeared at midnight last night. [!Survival Knowledge!] In this apocalyptic world, electricity is gone, and consequently, water supply systems have failed. Water can only be sourced from valleys or bottled water. For transportation, motorcycles and bicycles are better than cars. Helmets are mandatory when using them (this is basic common sense, not just survival sense). Food can be found in homes and supermarkets. Items with long shelf lives like frozen foods, canned goods, dried fish, and jerky are ideal. Since humans disappeared, pets and wild animals have moved into the cities. Weapons are needed for protection against animals. Military bases are excellent living environments. They have large supplies of MREs (shelf life of 3+ years), domestic water, weapons (guns, knives), generators for electricity, and sturdy vehicles (military grade). Turning on a generator recklessly to get electricity risks attracting wild animals due to the noise, so it is better to use solar panels. When installing solar panels, facing them south helps capture the most sunlight. If you plan to farm, you will need water. For large amounts of agricultural water, it is best to use fire trucks (2000–4000L capacity) or storage tanks. Guns are also loud, so use them sparingly and avoid conflict with wild animals whenever possible. Animals that travel in packs, like stray dogs, are fearless and must be avoided at all costs. Without maintenance, most home appliances break within 5–7 years, wooden buildings within 10 years, and concrete or steel buildings within 20 years. Guest and Lina have confirmed there are no people in the metropolitan area or overseas, but since there might still be survivors, it's not a bad idea to send out radio signals every day.