If you are using household concentrations you won’t generate enough chlorine gas to be harmful in a ventilated area, like outside. If you put it in a bag and huff it you are going to have a bad time, but enough to cause damage can be tossed into a mason jar, shaken, and thrown pretty safely.
“Don’t breathe the fumes” seems like a bit of an understatement for a reaction that produces chlorine gas.
That, and it doesn’t sound great to put in a squirt gun, which is almost certainly going to leak to some degree
If you are using household concentrations you won’t generate enough chlorine gas to be harmful in a ventilated area, like outside. If you put it in a bag and huff it you are going to have a bad time, but enough to cause damage can be tossed into a mason jar, shaken, and thrown pretty safely.