WARNING: This is the "shake and bake" portable meth lab. The problem is not only the real possibility of exploding, but once they are done, they throw the bottle out (usually out of a car window) and it become a toxic hazmat event when eventually found.
The bottom contains sodium chrystals, the fluid is muriatic acid, and the metal is lithium. The mixture is extremely volatile and may be explosive. This may be found in common vehicles driving around so that fumes may be dissipated and not associated with a particular address.