Greetings friend @minismallholding, and to the entire @naturalmedicine community. Well yes, the truth is relatively simple. As for the preservative, I usually use brandy.
Brandy preserves the energy of the essence due to the degree of alcohol it contains. There are other alcoholic beverages with a similar strength, what makes brandy always be used is that it combines two of Bach's flower remedies: the vine (vine), with which it is made, and the oak (oak), from which the barrels in which it ages.