I guess the non-stop vomiting would kill you first.
That's referring to the pure undiluted form. What does the FDA and CDC have to say about dosage/exposure amounts? And what about chemically neutralizing it at the water plant? Do we have any FReeper bio-chemists out there?
The LD50 for a human, correlated to the rat LD50, is going to be ~100-200 grams and the TLV-TWA is 50 ppm (200 mg/m(3)).
In as much water as it’s dispersed in, it’s going to maybe be an odor problem for a few days, with the resultant placebo effect on every one with the slightest itch, scratch or cough creating millions of dollars in economic activity for lawyers...