Hi there,
We use a mathematical formula which approximates the amount ethanol and water contract when mixed for diluting our spirit pre bottling.
This assists us to bottle spirit in an efficient manner and without recourse for spending money on software to do the same. However, our method is not quite right as at times we need to adjust our spirit prior to bottling to ensure the ABV is in the right tolerance range.
This can be time consuming so if anyone knows a fool proof method we would be very grateful !
Cheers