Getting wash out of empty liquid bottle

How would one go about getting the last bits out of an empty bottle of LSD? There is crystallization around the threads at the top of the bottle. Alcohol? Distilled water? Is there any way to approximate how strong the resulting wash will be?

 

I think your best bet is to set some time out, pull up your man pants, give it a lick and hope for the best.. unless you got a whole lotta lab equipment, and even then, I don't think it's all that easy to work out - plus there's a chance that the shit at the bottom won't be as potent as when you first got it(assuming you haven't taken 100% care of your vial).

 

The last bits inside a vile can be very potent. You don't know if your getting 5 or 50, the residue is probably on the bottle from top to bottom, that is all still LSD.

Pour some distilled water in the vile and drink it a few times. Or maybe just once and you could get a few trips.