I don't count drops, not accurate, a graduated cylinder really works best, I like the Pyrex ones, but they are pricey,  plastic ones will work too.   Another thing I've done is take the plunger out of a 10ml syringe, put the cap over the needle, put the whole thing standing in a narrow drinking glass with the open end up, and use that, after mixing, I use another syringe to draw my juice out and put it into a bottle.
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		