Before you leave your home, take a photo of your passport with your phone. If you lose your passport at least you have a photo of it. Although it won’t be accepted as an official document, you will be in a far better position if you have at least a photo of your passport. Depending on the situation and country you are in, you may be surprised at what you can achieve with just a photo of your passport. If you really want to be safe, you could email the photo of your passport to yourself. That way even if you lose everything you can always log onto a computer and retrieve a copy of your passport.