Bugout bags are meant to contain everything you might need should you have VERY little time to get yourself on the move. They're generally kept in convenient to reach locations such as bedroom closets, car trunks, etc. They are also another one of those items that can be specific to your current situation. For instance, someone living in New York City will need items that someone living in rural Idaho will not, and vice versa. However, there are basic items that EVERYONE should have in their bag. Let's start with food. You'll want to carry 3 days worth of food, but not just ANY food. You need to carry items high in protein and calories; you're most likely going to be doing a lot of walking and you're going to need the energy. Water, of course, is also essential. Researchers say that in order to replace water lost from the body through normal activities, the average person needs to consume 3 liters of water per day. That might sound like a lot but you need to remember that the majority of foods you eat now have a large amount of water in them. Most people consume 2/3 of their daily water requirement through the foods they eat. As your diet changes, so will your need for water. However, your Bug Out bag is not meant for luxury, it's meant for survival, and carrying 9 liters of water is neither practical nor smart. Ideally, you should carry 3 liters of water (one per day) and carry the means to purify more water as you come across it. A dry change of clothes is another important item people often overlook. An easy and convenient way to carry dry clothes is to get yourself a vacuum food sealer and seal some clothes in plastic bags. This method works for just about anything else you need to keep dry as well. These are just a couple of examples of bug out bag items, listed below are other items you might find helpful and links to help you get them for your own bags:
If you're prepared for zombies, You're prepared for anything!
Colorado Zombie Outpost