I've found this item to be extremely helpful when doing mundane field crafting such as synthing leather on the go, or reducing NPC trips while crafting. Its re-use timer is low enough to never need worry about it.
On seraph you save about 1.5k total buying this over water from the NPC. 11*12*40 = 5280 + 241 (Sell the tank when empty) = 5521 - 4000 = 1521 gil saved.
for your alchemy escutcheon, holy water synths to increase craftsmanship % are profitable instead of costly. This item and a cluster farming trip to sky.
