Vanilla Butter Cake from The Mermaid Bakery

I want to use this this weekend but in the comment section, the poster says to use vanilla pudding and 1/2 cup more milk. Is that a suggestion or what must be done?

Does anyone have a really good yellow cake recipe for a 12x18 cake that is moist but affordable to make?

I would also need the yellow cake recipe for a standard cake as well.

add the pudding to the dry ingrediants, and add the milk with the wet. Your cake will be more moist with the pudding and milk.

Thank you!