IIRC, a while after the heimishe storm erupted about bugs in NYC’s tap water, the DEP admitted that they actually add copepods to their reservoirs for “natural water purification”.
The coffee cock-roach issue is not new. And chocolate is supposedly not different in this regard. Someone I know sneezed almost every time he/she ate chocolate and therefore did an allergy test for cock-roaches. But the result was negative…
And so it’s a good idea to store open bars of chocolate in zip-lock bags. We’re not the only chocoholics around.