Gross margins on spirits are ridiculously high (60%-70%) at scale... but when you are running a small distillery everything is much more expensive. Your equipment will be less efficient, you'll distill more, filter more, age in more expensive vessels (e.g., oak barrels) than lower-quality, industrial-produced neutral spirits. OTOH, craft spirits are priced at 2X+ large brands, so there's still margin to work with.
If you're planning to distribute outside of CA, then you've got the three tier system to deal with. You need to find a distributor in each state (often difficult as they already have a stable of brands) who in turn sells to retail. You should plan that you'll get roughly 50% of retail price (as it is marked up by distributor and retailer).
So now if you create a $40 retail gin, your revenue will look more like $20+ (depending how much is sold direct to retail in CA or direct to consumer). Let's say you can get margins up to 40%... that's around $100 margin/case.
Now comes the hard part... brand building and selling. You'll need to hire a sales team to battle it out with retailers and distributors. ("Ugh, not another $40 gin that I haven't heard of.") Of course if you can figure out some great product positioning and/or some great branding and execute marketing well then that'll make selling easier.
If it's your passion then it's certainly a viable business - like everything else, it's a matter of execution. But the next 20 years of technology is going to have such a fundamental impact on humanity - don't you want to be part of that?