How to reset a disabled 5th gen. iPod without access to a computer?
You need iTunes to restore an iOS device. It doesn't have to be your computer—any computer from friends/family will will do.

If Find My iPhone is enabled on the iPod and the iPod is connected to a Wi-Fi network, you can log in to iCloud and erase the iPod. Once the iPod is erased, you can sign in with your Apple ID to deactivate Activation Lock and set up the iPod as new.