Q: I don't have a computer, but my iPod is saying it needs to be connected to iTunes to complete iOS 8 update.

If one of these programs will not kick the iPod out of recovery mode then yo will have to connect to iTunes and restore and thus erase the iPod.

For PC

RecBoot: Easy Way to Put iPhone into Recovery Mode

or

http://joshuabailey1997.wordpress.com/2010/09/02/recboot-v1-3/

If necessary:

Download QTMLClient.dll & iTunesMobileDevice.dll for RecBoot

and                                           

RecBoot tip

RecBoot may have problems on 64X windows, then try:       

Tenorshare ReiBoot – Enter & Exit iPhone, iPad, iPod Recovery Mode with a Single Click

For MAC or PC       

The Firmware Umbrella - TinyUmbrella

Installs blootware on PC too

You may be able to get some info off the restored iPod by:

How to perform iPad recovery for photos, videos

Wondershare Dr.Fone for iOS: iPhone Data Recovery - Wondershare Official     

http://www.amacsoft.com/ipod-data-recovery.html

iPod recovery software to restore lost music files      

http://www.pcrecoverytools.com/ipod-data-recovery.html

Restore from backup if you have one:

To restore from backup see:         

iOS: Back up and restore your iOS device with iCloud or iTunes

If you restore from iCloud backup the apps will be automatically downloaded. If you restore from iTunes backup the apps and music have to be in the iTunes library since synced media like apps and music are not included in the backup of the iOS device that iTunes makes.

You can redownload most iTunes purchases by:

Downloading past purchases from the App Store, iBookstore, and iTunes Store   

A computer with iTunes and an internet connection is required. Go to a friend's place or an Apple store.

Normally you can update via wifi. However, your iPod encountered a problem during the update and now you have to connect the iPod to a computer a I previously stated.