| Jbthoughtful24 |
I would say considering the multiple sources that allow melee poisoned weapons to deal poison on more than one strike that it makes some sense to apply to multiple arrows.(Lasting poison rogue talent for one) Using something similar to poison sheath as a custom item. Call it poison quiver if it is a permanent item, or 2 potion sponges at the bottom gently push the arrows into the sponges at the bottom. The sponges would be single use in my mind adding more expenditure for additional utility. You would need to keep track of ammunition closely for this.
Acknowledging that the original intention is to be one vial is one weapon dose as the base rule for application in combat. The time for a poison to expire outside the vial means you need a way to keep out air if you poison ahead of time.
If you use the weapon blanch idea of 1 melee weapon or 10 ammunition, 2 doses for a bundle of 20 arrows or bolts. This makes sense if you can keep the dose from expiring in open air.
In conclusion since sources exist to extend use of poisons on melee weapons one dose per weapon is an application limit for quick and dirty use not the upper limit. Sources exist to apply poison ahead of time so we can make similar items using those and similar ideas as a basis for balance.