Hi, I'm having a hard time sourcing out Organic Rose Hydrosol that is preserved for my formulations. I have heard that using an unpreserved one is risky. However I have found a nice organic Hydrosol that is unpreserved from a good source. Should I add leucidal preservative to it as soon as I open it? Do I need to preserve it at all? I do add it to my heated water phase of my formulations. Any take on this?