what is [flavor-wise] the closest nonalcoholic substitute for white wine and red wine? White wine and red wine have great flavors when added to a dish. But because I'm on medication, I'm not able to use wine (my body would have odd reactions when I consume food cooked in white wine) I wonder what is flavor-wise the closest nonalcoholic substitute for white wine and red wine?

I have looked at What is a substitute for red or white wine in a recipe? But the answers were not satisfactory. For example, chicken stock has a completely different flavor when substituted for white wine and so does white grape juice. What is [flavor-wise] the closest nonalcoholic substitute for white wine and red wine? Thank you!
I depends on the recipe, but generally no, white wine vinegar is a very different product than white wine. Vinegar is produced when bacteria eat alcohol and produce acid which changes the flavor dramatically. If the recipe calls for acid already (for instance lemon juice) then it can work, you just reduce the additional acid. The result will still be different though.