When Danni, Max and Alison are in the witches house or the museum, Max grabs a Zippo lighter out of the case and lights it up. Zippo lighters do not come with lighter fluid already in them. And even if they did, from the look of the museum and the cobwebs all over the Zippo case, you can tell that those lighters had been there a long time. Meaning if there was any lighter fluid in them it definitely would have evaporated by then, since Zippos aren't air tight like plastic lighters.