I'm very keen to follow the square bottle design as shown in the attached files (Cold brew coffee)
Also, if looking at other competitor products then I am particularly keen on the Health Ade and Wild Fizz brands. I'm not keen on the Karma, Equinox, Go! or Love Kombucha bottles. I'm in the middle on the JAR and Captain Kombucha ones.
In terms of logo, as described, something modern, colours can be standout however there will likely be different flavour varieties as the brand develops, therefore it needs to not be so distinctive that it dominates a design.
Finally, I'll be looking to get some packaging designs made up (as per the cold brew style bottle in the attached pics) that can be a follow on project, a mockup of the logo in situ (obviously not the final packaging design) would be really useful, though not essential.