You cannot rip DVD files to your computer without a DVD+R(W?) drive. You CAN rip the files at your friend's house, then put those files on CDs (as far as I know), but you're going to need a LOT of CDs. It'd probably be more cost-effective to just drop, what, like $30 and buy a DVD-RW drive for your own computer
. Newegg has a lot of other cheap drives, so look around.