You can download the entire web site with all internal links, videos, pictures, audio everthing using a WebReaper - Offline Browser.
It is entirely free of cost.
You need to enter the URL of your desired site to be downloaded and hit the Go Button.
WebReaper will do everything for you.
After finishing the download, you can view the pages without connecting to the internet.
You may customize the filter options to filter unwanted file extensions using this application.
You may copy the downloaded web site content into USB - hand held devices.