I had some weed a few years ago before I started growing that I thought had been sprayed with some kind of perfume. It was really weird but it made my lips go a bit numb when I smoked it which I think might have been the alcohol in the spray.
Obviously I couldn't prove this was the case so it ended up in the bin.
Your guy might not have known to be fair to him. Street weed goes through a lot of hands somtimes.
If the weed was tampered with, it's likely because it was either harvested too early, or poorly dried, hence losing its smell and taste. Unfortunately I don't think curing it for longer will help.
Maybe the water option is the best idea but I've never done it so can't give advice on that.
Shame this happened to you mate and good luck salvaging it if you can.