Alchemist Focus

While holding this rod, you gain a +1 bonus to spell attack rolls and to the saving throw DCs of your spells.

In addition, all your experimental elixirs you create with this item don't lost the effect in a long rest. 

You can us an action to transform a potion in to a splashin potion. When you use this feature you can trow the potion as a free action.

Splashin Potion. A potion that can be trown which a range of 30 feet and in the spalsh have a 5 feet area. The target can make a DEX saving trow to your sepll DC to avoid the efect of the potion.  

Notes: Bonus: Spell Attacks, Bonus: Spell Save DC, requires attunement by a Alchemist