There is the Flask Thower, and Launching crossbow, which can fling Holy Water, and can be both Masterwork, and Magical. The Syringe Spear can be filled with Holy Water.
You wouldn't want magical flasks anyway. The hardness & hp of the flask increases. It'd be HARDER to break. Masterwork for 300 gp / 50, sure, but not magical.
You wouldn't want magical flasks anyway. The hardness & hp of the flask increases. It'd be HARDER to break. Masterwork for 300 gp / 50, sure, but not magical.