They all taste wretched. I used to puke just from the smell of heroin, which was really interesting when you have to cook up tar heroin to shoot it, which has a particularly pungent smell compared to most dope. The worst tasting drug period.
Acid, you can't taste it. Supposedly it's bitter because it's an acid (pH factor) but it's so potent you can't taste it, anyone who says they can are lying, they just taste the nasty sweat of the blotter being handled by people. You won't taste acid, you need to take like 20 hits to get any taste of true acid, and even then probably not. Probably have to drink a gram or so of real, pure acid to taste it - pure crystals, not the alcohol it's diluted in. No one here has tasted acid...
The best tasting drug I think, are shrooms. They taste like unsalted sunflower seeds, which is why whenever I take shrooms i put a bit of salt on them, so they taste like sunflower seeds. Best way to take shrooms, not pizza, not PB & Shroom sandwhich, but slightly salted shroomies.