Has anyone tried pre batching Old Fashioneds? I measured the amount of dilution from a single OF to be c.20ml of water (from high quality big ice) so when I did 10x the specs (600ml Bourbon, 50ml of 2:1 Demerara syrup, 12.5ml Angostura) I then added 200ml of water. I put in the fridge for two days but when it came to serving, having shaken the bottle before pouring over big ice, it felt a bit over diluted/thin. Any ideas for correct water specs? Simon have you done an article on prebatching?