A key element to remember during all points along this bottle re-purposing process is to examine the bottles. Look for any flaws and if spotted, send the bottle straight to the recycling bin.
|I noticed these cracks on the bottle while cleaning.|
Why would we need to examine the bottles? In short, they will become damaged.
I've accidentally chipped the top of a bottle while bottling. I'm glad I noticed and scrapped it, as it would have never held any pressure. I've seen bottles that form little cracks in the neck and around the top. This may be nothing at first, but it is definitely the start of a degradation which won't result well.
The bottles won't last forever, use after use after use....after use. So, while going through the process, examine each bottle. When you see a crack or other developing flaw, pitch it to the recycling bin. It will save trouble.
Easy enough, right?