Dunno whether it has any effect to begin with but with the water magic perk (just learn any 3 water spells, the books not the scroll bonuses) you can craft transformation items to alter it for free. The base food items are super cheap and can be farmed from encounters too.PS: People what's the most profitable milk type?
Or use a demonic character, they can self-transform completely free from the get-go. Then just cycle through the options, and test the modifiers such as alcoholic fluids separately.