A friend of mine used plastic bottles with plastic caps (like coke bottles) for bottling. He used sugar (Granulated Sugar of Sugar Beet) for priming.
It turned out those plastic bottles have problems with caps and the bottles lost too much CO2. The bottles have very liitle to no carbonation right now. He wants to recover those bottles somehow.
He does not have any equipment for CO2 flasks or tanks, so he will use sugar or malt for this purpose
A few questions over this issue:
- Is it safe to transfer plastic bottles to bucket and refill glass bottles (which are suitable for standard single-use caps) or changing the container is not safe?
- Can he re-add priming sugar (the same granulated suger or dextrose or malt extract) to bottles? Will currently existing yeast within beer be enough for this or will he need to add more yeast prior to adding priming sugar?
- Any other steps while doing above?