We don't need to question motives, but we should consider and plan what we realistically need in our urban environment. Water, food, medicine, medical care, shelter, clothing, communications, and sanitation. You may have a different concept. However, when you look at these...be realistic. I would urge you to start making your own list for your Bug Out Bag, and then reference the below list.
The widest variety of gear and philosophies are found in 72 hour kits (Bug Out Bags). Many provide little of what you need. The Mayo Clinic indicates you should intake 13 cups of water every day (about 25% of that may come from you food). Additionally, an inactive 40 yr-old requires about 2,300 calories per day. Most kits fall short. Others assume you will be isolated in a wilderness with abundant resources. Still others have a more apocalyptic load out.