Last night I got some good advice which I thought I would share. I have some "Timmy's Double Double" e-liquid which does take just like the coffee. I find it too mild though and not much of a throat hit. I was advised to just mix in some menthol. I must say that it works great. The menthol, when you mix in about 1/4 of it to your mild one, gives it more zap without destroying the flavor of the original. I would assume that will work on any mild e-liquid. 
