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There is a Legacy version here.

PFS StandardCombine Elixirs Feat 6

Additive Alchemist 
Source Player Core 2 pg. 65

You can add the full ingredients of a second elixir to an elixir you make to create a hybrid concoction. You must expend an additional versatile vial to make this combined elixir, and the ingredients must be for an elixir you could create with Quick Alchemy. When this combination elixir is consumed, both the constituent elixirs take effect. For example, you can combine two lesser elixirs of life to create a combined elixir that heals twice the normal amount, or you can combine a lesser darkvision elixir with a lesser eagle-eye elixir to both gain darkvision and find secret doors.

Traits

Additive:

Feats with the additive trait allow you to add special substances to alchemical consumables you create when you use Quick Alchemy to create a consumable (you can't use additives with quick vials). You can add only one additive to a single alchemical item, you can add an additive only once per round, and most additive abilities specify a subset of alchemical consumables you can add them to.