Additionally you would never be given vials of freebase (oil) meth or MDMA to ingest.
Why: because 0.5ml (an extremely small amount) of it is the equivalent to HALF A GRAM of powder!!
If meth was out there in freebase form and not sold with automated pipettes as used in biochemistry laboratories, people would be dying all over the place.
And of course as it is not soluble in water it is not readily diluted in water is it - unless the water is strongly acidic. You just wont see it.
As Phase said if it is MDMA or meth in a form that the layman would describe as a "liquid" it is the drug dissolved in water; a solution, plain and simple.
A side note to 1,4BD and alcohol.
I think there is a possibility that the liver with metabolise ordinary alcohol BEFORE 1,4BD.
The only evidence i have is my friend once stupidly had 1,4BD after alcohol when quite drunk - despite a couple of doses of 1,4BD it had very little effect on him at all.
He then gets home sometime later, enough time for the liver to have gotten rid of the ethanol he had drunk.
BANG - he became dizzy, could barely walk or stand up, felt as if he would become unconscious and truly belived he was close to death.
It is hard to say what caused this but a good guess is that the 1,4BD was not processed to GHB as readily as normal due to the ethanol in his system - once that was all gone, the GHB effect then really kicked in.
It just goes to show how unpredictable and dangerous all the G analogues can be with alcohol - especially 1,4BD.
Its the one combo u just do not do - never, ever, ever.
End of rant.