Bottle Shelves What Is The Shelf Life Of An *opened* Bottle Of Vodka? I've Only Found References To Unopened Bottles Online.

What is the shelf life of an *opened* bottle of vodka? I've only found references to unopened bottles online. - bottle shelves

I have an expensive bottle of vodka, fruit tea, which opened two years ago and stayed in the temperature-controlled storage, half-empty, since its original cork seal. I read online that it will eventually break the spirit of the chemical composition of the glass bottle and then drink more alkaline, and disagreeable. I've also read that vodka has a limited life as a pure vodka. Is there truth in these statements? What are the facts?