When I made the bottles myself, I took the 2 liter label off because it made it easier to work with, actually just using them as normal buckets right now. I've got perlite in the bottom 2.5 inches and then a mix of 1:1 perlite/potting mix. I think it was in Jorge Cervantes Ultimate Grow that I heard about the lights on the roots and I was like oh shit, just cuz I don't want to run into problems, but yeah it'd probably be pretty simple to throw some duct tape around it and fix it now.