Originally Posted by GamblerGORD53

Wire style cages are OK for plastic bottles, Gatorade or whatever. I use the short stubby Gatorade ones. I adjusted the fit of a stainless cage, and it wouldn't hold proper after that. For my Kleen Kanteen thermos bottles, ONLY my DIY CF will do. Luckily they are almost the same size.
For a form, I use the thermos with an innertube wrap for extra space. I then have a stick to make a groove for the bolts. Non-stick plastic on both sides of the wet CF. Wait about 25 hours and pull the thermos before it is full hard cured. It takes a really hard pull to get the form out. Trim the top with snips at this time too.
I then put the bottles in a sock and slip it in, a perfect snug fit. Also helps to keep them cool.

Actually, I just bought a new roadster and a new batch of CF supplies to make some more. How I'm going to hide the smell in my apartment is another matter. LOL.