A wand equivalent for Brother's Alchemy.

You can "Charge" the Spray Bottle with a Spell Extract (which is a bottle of magic extracts).
You can cast the spell on a block (useOnBlock), on an entity (useOnEntity), or on self (use).

I think the spell extract should be able to take damage while in the Spray Bottle (and eventually break/disapear), but maybe the Spray Bottle has custom durability and when it reaches 0 the Spray Bottle is empty (and you have to put in a new Spell Extract).