If you've played through to the end of where you're at, you should have an idea. Think things through about what you can learn from those deaths and what you might be able to use to stop it from happening.
The first password is given for free, its in red, after that you will need to pay close attention to things that are said during the day and the bad endings. Don't worry too much about the choices they most affect orlando route at the start and are more for character development than affecting the bad endings, endings are all to do with password.