Reinstalling Lion on a Wiped Disk
What model Mac do you have? That will limit the recovery options. Internet recovery or putting your Mac into target mode and connecting it to another Mac to run the installer are two good places to start. 

Also, you can install Lion onto any old USB drive and then bring that to your Mac to boot up and fix things. Remember you only need a Mac that runs 10.6.8 to get at Lion from the app store. As long as you have an Internet connection, you can download the lion installer and run it to install over your Mac. Assuming it has a FireWire port, you can run the install in target disk mode. If not, you'll need to install to an external USB drive then take that drive to your Mac to boot things up.