Unfortunately, cutting drugs with things to make them either cheaper or stronger is pretty common most places, in fact it’s basically universal here. Some weed dealers have relatively uncontaminated stock, but most don’t.
And good fucking luck if you buy any kind of pills or anything.
Nice bar: whatever menu cocktail or specialty product looks good.
Okay bar: Amaro/mezcal if they have it, gin/rum if they don’t.
Not very good bar: beer or cider
Bad bar: bottle beer. No cans, mixers, or taps, and well pours only if truly desperate.