cotton yes .... bought this 6 months ago and still only half way through it and I build lot.

for wire i would go to kidney puncher

If you don't already own a drill... pick one up for twisting wire :) I did... and they are on sale for Fathers Day LOL

Could pick up a juice display rack

Some cotton pads for wicking if yer into that....

Some glass bottles for juice storage

Noalox for your mods if you need it.

Ultrasonic Cleaner for cleaning your tanks/coils/drip tips and ... steeping? Ive never used it for that, but I think I read someplace you can....