For Repairs/Recovery:
One is to use the build in recovery installed on your hard drive. To check for it use disk utility, but it is a hidden partition so make it non hidden first.
Second one is to use the Internet Recovery.
For clean install:
is to create a bootable USB, with complete ML installer. (you need to have/purchase the ML installer package), and a USB with 8GB space.
http://macs.about.com/od/usingyourmac/qt/How-To-Re-Download-Apps-From-The-Mac-App-Store.htm
Example:
OS X Recovery Disk Assistant v1.0
The OS X Recovery Disk Assistant lets you create OS X Recovery on an external drive that has all of the same capabilities as the built-in OS X Recovery: reinstall Lion or later, repair the disk using Disk Utility, restore from a Time Machine backup, or browse the web with Safari.
Note: In order to create an external OS X Recovery using the OS X Recovery Assistant, the Mac must have an existing Recovery HD.
To create an external OS X Recovery, download the OS X Recovery Disk Assistant application. Insert an external drive, launch the OS X Recovery Disk Assistant, select the drive where you would like to install, and follow the on screen instructions.
