so on the bottle it has the 4:1 10:1 and so on marks that you fill up with water first but then where do you fill it up to with product? top of the lable? to the bottom of the neck? to the very top?

and on a side note, am i the only one who gets the urge to taste HD? it smells delicious

 

The the bottom of the neck, or where the bottle stops being "uniform" and starts tapering in.