I drink diet coke with splenda (different from regular diet coke or coke zero). Most bigger stores carry it, but not all, you have to look for it. I don't drink it out of the can or bottle, I pour it into a glass. For some reason it tastes much better out of a glass. I keep the cans in the fridge so they are cold and I don't put any ice in the glass as it gets watered down with ice and doesn't taste as good.
That's my MO!