If you have an ASP.NET Web Site project type (the one without a proper .csproj or .vpproj project file and that is just a folder of loose files), then when you add a package
This is based on GC.'s solution above. Add a class library (csproj) and reference that class library in the website project. Add the nuget packages to the class library. In the class library, actually reference the nuget packages in some class file. Maybe create a throwaway instance or something. You can use any class that's contained in the package. This forces the .dll to be copied to the Bin directory in the web site project.