Some traditional recipes you find will advise you to mix the juniper ashes right in with the corn and water. It all depends on ‘what your grandma taught you’.
I suggest to strain the ashes first.
Juniper Ashes Water
To make water: Bring water to a boil, remove from heat and add ash. Steep 10 – 15 minutes and strain into separate container. Make only what is needed and use immediately, because it does not keep.