I love real grape juice, also. I happen to love the dark Welch's grape juice. I asked this same question a few weeks ago in a new thread here, only I asked for a vendor recommendation for that. I don't believe I got a response.
I've tried a few grape flavors.
Smokeless Image has a
Classic Grape that comes the closest to what I am seeking, but its flavor intensity is lacking, and they don't offer any customization. I've considered getting some concentrated flavor liquid to add to the Classic Grape, but haven't done it. (Note: SI sells two grape flavors,
Classic and
New. The New tasted yeck.) I have added just a touch of
Ice Menthol to the
Classic with enjoyable results.
My Freedom Smokes lists an e-juice that they promote "tastes just like grape juice".
I tried it in "extra strong flavor", and couldn't vape it because of a perfumey taste and aroma. It does state on the website and on the bottle "may need to be reduced", so maybe that is the issue with my experience with this liquid and your experience may vary. They do offer another grape on the site that may be more to your liking. I ordered two other juices from this vendor that I actually liked quite a bit. They have a Sweet Cream e-liquid that I like to mix with
Copper Creek's Coffee (excellent mix!) and a
Vanilla Cream Caramel Coffee that is a nice, flavorful juice (required a little steeping).
I have heard of an Italian flavor company marketed here in US as
Richies that I've heard has a grape flavor close to grape juice, but I haven't found a vendor that sells it, let alone tried it.
You might want to look at this one:
http://www.mister-e-liquid.com/grape-ice/#reviews I hear great things for the
Lemon Ice e-juice. I keep thinking that I will get a sampler order of some of the fruit ice juices, but I haven't pulled the plug just yet...too many other interesting juices out there to try.
And try some others from their Ice line as well while you are at it...I have tried so far Grape Ice, Raspberry Ice, Apple Ice & Lemon Ice, and like them all.
