Fresca rn; other faves are Cafe Bustelo instant, Diet Coke, and ice water.
Booze: Black Velvet, if you please (sorry; couldn't resist the Alannah Myles reference, and I know she was singing about Elvis Presley). Sometimes I'll get a handle of cheap-shit vodka, chill it, then mix 12 ounces of that with 12 ounces of cold Fresca and drink it that way. Australian wines are also pretty good; my fave is Yellow Tail. I used to be a big beer drinker, till all those carbs and empty calories made me a fat fuck.