Even if it isn't harmful, they shouldn't do it on principle. Engineer a society where everyone is dependent on the same water source…then put chemicals in it? Assholes.
That's well understood. We're not here to talk about fluoride apart from asides. Fuck off you absolute faggot.
Fast food places have gas and a lot of grease in them, so they burn very well. They have exhausts filters on the roof that ignite when embers hit them as well.
That's some good digging.
Concealed weapons. Bad news.
Please don't.