Preheat the oven to 350 degrees F.
Mill your wheat berries to a fine setting on your grain mill.
In a large mixing bowl, add the water, milk, eggs, oil, sugar, honey, and vanilla extract. Mix until smooth.
In a separate bowl, combine the flour, salt, and baking soda.
Pour the dry ingredients into the wet ingredients and mix until you have a smooth batter with no dry bits of flour remaining.
Prepare a 9x13 rectangular cake pan by spraying with oil and dusting with flour.
Alternatively, you can use two 9 inch round cake pans.
Pour the batter into the prepared pan.
Bake in preheated oven for 50-55 minutes or until a toothpick poked in the center of the cake comes out clean.
Allow the cake to cool on a wire rack completely before icing.