I still have an ancient bottle of Dubonnet ( one of Lillet too )in the liquor cabinet; however, both are from France!
I have now forgotten why or how I even came upon the whole Dubonnet and Lillet drinks, only that for some reason or other, people were drinking these two things, as appertiffs in the late '70s-early '80s...so I had it on hand and remember that they weren't bad at all; especially in the summer.
I wonder how long an open bottle ( with the tops tightly closed ) last.
It’s a fortified wine so it might be ok.