Before you even build a business plan, and I recommend the lean business canvas to start, I wouldn’t make sure that you dial in what people want.
Regarding the wines, I would assume that is almost immaterial. You will likely end up with blends.
Another angle: You can use this to your advantage by negotiating overstock or expiring inventory from vineyards. Of course the challenge with this is that the product taste will change depending on what vineyards are looking to offload.
Right now, it’s not clear that you know who you are selling what to. Perhaps it’s an underserved market within wine? Nail this down first, and that will drive everything else, including the can design.
IMO right now you are working on a hobby or side project. You still need to validate the MVP, and you are pre-revenue with no major investment.
I would continue working on it but try to find something stable, with minimal stress, that allows you to put your free time into the startup.
As you said, you are doing OK financially. The best time to look is when you don’t NEED the job, as then it will be too late.