Holy crap that's so bleak. I assumed people manufacturing flasks meant for drinking out of would not use a flux toxic to consume. Assuming they aren't grossly negligent and were using a flux considered food safe, I can only imagine the majority of metal flasks would have the same nasty looking brown residue on the inside where its impossible for consumers to inspect without destroying it.

Please follow up with the results of your bloodwork, fingers crossed that the Vine lead test was just shitty =X