Jumjum is a tier one item received from "ravaged natural garden" and names like that. These can be found in Sunken City, the Ruins and the Graveyard on the Freeport side of things. I don't know about Qeynos, but whatever beginner zones are connected to the city should also have these kinds of nodes. The only thing is these nodes give out tons of other stuff too, all of it aimed towards cooking. Just keep at them until you get what you need.
I nearly have a stack I've gathered just to raise my skill. If you're on Mistmoore, I'll sell them to you for a good price.
I don't know about your jumjum wine; hopefully someone else can follow up on that.