Master Alchemist Delivery System

[Conaill]

Check out the "Gnome Calculus" in WotC's latest "Arms & Equipment Guide". Silly name, but it's exactly what you're looking for: an oversized sling with a 50' range increment.

 

[Sollir Furryfoot]

I recall there's a Launch Object spell in Magic of Faerun, its either a cantrip or 1st and it allows you to toss an object size tiny or smaller up to the spell's distance.