I have poured something from a small jug onto my fries in Wuppertal. This turned out to be milk, so I was not best pleased. I could fill my hip flask with vinegar, but that would strike people as weird, and the flask would hold a year's supply of vinegar.
There is an article in today's Guardian about Malt Salt. Vinegar flavoured salt. Now that Amazon supply groceries, I did try to see if I could order sme from them, but no (not yet anyway).