I don't drink alcohol anymore, well I'll have a beer at the pub or one glass of scotch every once in a while because I enjoy the taste. But in the past I used to drink to excess relatively often, especially if I was hypo or full blown manic. I used it as a coping mechanism.

As for stimulants, just caffeine. I have to have my coffee every morning right after I get up but other stimulants feed my anxiety so I avoid them.