First of all, I want to state, that I consider myself to be closest to the source of good chocolate: I can see the Fassbender & Rausch shop at the Gendarmenmarkt in Berlin from my office window!
Then: this must be a very crazy German person to take German bottled water with him!!

I can understand the German point of view of wanting a sparkling water (at least I assume that's his reason), but sparkling waters are much more available in the rest of Europe then they used to be in the past...
Finally, NHdisneylover: FRA actually has quite a good selection of German wines available after security. I have bought bottles as gifts there in the past. I remember that they had Kloster Eberbach wine. But depending on which gate you are leaving from you might have to go through a second security point.