Potion Bottles:
First Step: print out labels
I got Printables from:
http://www.fantasyjr.com/printable-halloween-labels/
http://www.overthebigmoon.com/halloween-decor-harry-potter-potion-bottles-free-printable/
http://pureblackmagik.deviantart.com/art/custom-Potion-labels-322763469
I could have used other sites, but I just don't remember exactly. I printed them LAST year and just now got around to doing it.
Second Step: save glass bottles--hoarder style. For like a year. I purposely bought certain products like olive oil and sauces in cool glass bottles so I could reuse. Like I said hoarder style. I think I even forgot some of the bottles I saved.
Third step: after I printed and cut out the labels I matched them up with the appropriate bottle. Then applied using modpodge.