I had some vodka left it in the bottle forgot to refrigerate it and the cap may have been slightly opened for like 3 days but when I tried the vodka again it didn't even taste alcoholic, did it just go bad or did someone swap out my vodka or something.
Answers (2)
You really need to start paying more attention to the world you live in. You know, like read a magazine while you sit in a waiting room. Vodka is 40% alcohol and 60% water. The alcohol evaporates easily, so it smells like alcohol. If you let it sit open for a while the alcohol goes away and you only have the water left. It does not "go bad".
Wine has 14% to 20% alcohol, beer might be anywhere from 3% up to 12% or so. Ice cream has alcohol, but only about 1/2%.