Sure, you can make fake wine. Easier to start with wine, of course. But there are a few hundred things in a good wine, I'd guess. You could squirt the right amount of each one into a glass and away you go. I don't reckon anything close to the right number have been identified and understood, and there are volatile things that contribute to aroma and non-volatile things that contribute to texture and they would need different methods to measure. Lots of things might not be available off the shelf. Probably some polymers. So a big analytical problem still tbd, and then you have to have a spray bottle of each component. But I don't see why it should be impossible. Just a lot harder than growing grapes.