[Graci]

Hi @Sibech, thank you for your help, much appreciated. 
Just so you have an idea, we sell Tea Tree Hydrosol at AUS$7.00 per kg (around £89 for a 20 kg drum). 

[Graci]

Thank you @Gunther. We are growers of Essential Oil and the Hydrosol is produced naturally during the steam distillation process. The Hydrosol then has some therapeutic properties and a mild aroma from the EO.
We only sell 100% Pure and Natural and our customers add their chemical or natural preservative themselves. The shelf life on the Hydrosols is usually 12 months, but it all depends on how their are stored. 
I’m aware Hydrosol is way more expensive than DI water, however, I would like to study the difference in cost, but I see that there are many variables and will be hard to make a comparison. 
Thank you.