Single Search Boxes: One Search
For the others you have the option to copy either the content box or the widget code (both will work). When adding content to a page, one of the options in your dropdown menu is "Media/Widget." Choose this and in the box that pops up click the tab that says "Reuse Existing Widget." Then do a search for the title of the widget below you want to use. Again, choose "floating box" to hide the borders and show only the widget.
The two widgets below both do a simple everything search of discovery. The first is called "Discovery Single Search Widget 1" and the smaller version is called "Discovery Single Search Widget 2."