So heres the deal, Mr.Beer comes with 6 or so plastic bottles (PET plastic). Does that mean i too can use plastic bottles (commercial plastic; coke bottles), until i get my hands on 50 or so glass pop tops?
I only use PET plastic 'long neck' bottles. I replace the caps every 2 or 3 uses and I've never had a problem. If you're going to re-use pop bottles I would check with your LHBS and see if they sell new caps for them.
I prefer them to glass because they won't break. I've also aged beers in them for over a year with no problems so don't worry about oxygen permeability.