I want to add a user account management system to the DAL of my project. Can I install or add Asp Identity 2 to it as a package? Or should I create my own tailor made account management system?
Yes, you can install ASP.Net Identity 2 your DAL system. You must install these and these packages to your project. There is also a samples project available in nuget (install this to an empty ASP.Net project.
Have a look at this post to learn how to implement ASP.Net identity 2. Obviously you can customize almost all aspects (such as creating custom provides etc) of ASP.Net identity 2 to fit your needs. Here is a good start for customizing your implementation