How to re-install Yosemite without external hard drive?

My  rMBP has been having battery issues the last couple of months, and I believe that it's due to my installation of Yosemite.  I'd like to do an fresh install of it, but I don't have enough money to buy an external hard drive for Time Machine. 
What are some other ways to install Yosemite with just the MBP itself?
Thanks!

Restart with the Command and R keys held down and perform the installation and other functions normally. This process doesn't directly use the external drive, but if a problem occurs and you don't have a backup, you may lose some or all of your data. If you choose to erase the partition with Yosemite on it, you will lose all of the data on that partition.
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