I've read you're not supposed to have any metal at all come into contact with the kombucha. So a stainless steel thermos probably wouldn't be the right vessel. Everything I've read says glass only. Plastic is porous and can cause the introduction of the wrong kinds of bacteria.
But then, what do I know --- I'm trying to grow my own scoby using a bottle of plain booch - its been sitting on my counter since August 27 - there's some slimy looking stuff on the bottom of the jar - but nothing that looks like a proper scoby.
1. Love ME no matter what noises are screaming at me, or who is trying to tear me down.
2. Eat to heal
3. Move to live
4. Embrace today
5. Live with intention
6. Respect my body
7. Cultivate joy
8. Find my passion
9. Meditate on peace in my soul