A CD is not the only way. You can download a bootable floppy from Apple's Older Software Downloads page. This one should do - Macintosh/System/Mac_OS_8.1_Update/Disk_Tools_PPC.img.bin
However, downloading and formatting a Mac boot floppy on a PC is tricky. Perhaps the easiest way is to use the Performa itself. You can use a standard 1.4MB floppy disk - format it in the Mac and you should be good to go, provided the Mac has its Ethernet dongle /modem and you have access to a LAN /dialup internet
If you don't care about saving the disk itself, there are destructive ways of securely erasing the disk - large magnetic fields, fire, thermite, dismantle the drive and scratch the platters, smash them with a hammer, melt them etc...
If you are near a university, college or public library or A/V department, you could ask if they have a bulk magnetic tape eraser - that would do the trick.
Once that's done, a listing in the Trading Post for the system / parts should draw some interest
However, downloading and formatting a Mac boot floppy on a PC is tricky. Perhaps the easiest way is to use the Performa itself. You can use a standard 1.4MB floppy disk - format it in the Mac and you should be good to go, provided the Mac has its Ethernet dongle /modem and you have access to a LAN /dialup internet
If you don't care about saving the disk itself, there are destructive ways of securely erasing the disk - large magnetic fields, fire, thermite, dismantle the drive and scratch the platters, smash them with a hammer, melt them etc...
If you are near a university, college or public library or A/V department, you could ask if they have a bulk magnetic tape eraser - that would do the trick.
Once that's done, a listing in the Trading Post for the system / parts should draw some interest