I think we might want to consider that the water bottles are there to give the thug legitimacy when running into road blocks.
“Just taking water to the fire fighters, officer.”
Blue jugs indicate kerosene.
Between gasoline and diesel (#1, #2 oil)
Kerosene catches fire with an open flame but burns/consumes much more slowly.
And, there is no big WOOSH! of the hovering vapor layer like igniting gasoline.