I’ve not grown fire og, but can’t be much different than other og kush crosses which I have grown tons of. Not that its really hard to grow, but can be hard to get larger yields from them, so you grow some seeds, find a good pheno with the qualities you’re looking for and nice yield and clone away.
Not really sure what RSO is, after looking it up, seems similar to what I call tincture that I make with Everclear, but seems RSO uses ethanol or rubbing alcohol. I would never use rubbing alcohol for anything I’ll be drinking, even though it’s mostly evaporated/cooked off.