Got into trouble when trying to clean install mac but forget to download the installer. plz help

hi everyone, I am using retina macbook pro. i wanted to make a clean install for my macbook, so i erased everything in my macintosh HD in DIsk Utility. afterthat, i realised i have to get the mountain lion mac installer into the usb before wipe off the HD. so what should i do now? i have no installer and cannot get back into my mac either (since i earsed my mac already).
thanks a lot!

If you did not partition the drive:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

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Message was edited by: Limnos

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