Spatter Solution

Potion, common

This bottle of effervescent liquid can be mixed with non-magical acid, alchemist’s fire, holy water, and similar alchemical weapons. When that item is thrown and hits a creature, the alchemical substance splashes on nearby creatures. You can choose a second target adjacent to the first, which takes damage as if they had been struck by the alchemical item without the need for an attack roll.

In addition, any other creature within 5 feet of where the alchemical item hit (choose one square of a target’s location if it is Large or larger) takes minimum damage of the type dealt by the item (e.g., 2 radiant damage for holy water).