Had a tank tonight that needed to be filled. It had a mL or so of some off the shelf flavored liquid. I topped it off with unflavored 50/50 and added two drops of TFA apple flavoring. MAN this is a good tank !!! Now a very mild flavor. I'll just enjoy it, knowing that I will never be able to recreate it.
My absolute most pleasurable vape moments are vaping bottle-bashed flavors I know I'll never be able to recreate.