In general, you'll get the smoothest, most dairy milklike flavor from soy, which is low in fat.
From the courier-journal.com
We've listed some pros and cons of milklike beverages, which should never be used as a replacement for breast milk or infant formula.
From the thestate.com
It wasn't cheap, about $1 a pound, but it could be mixed into inferior milk or even water to create a milklike liquid that would pass government nutrition tests.
From the dallasnews.com
More examples
Milky: resembling milk in color not clear; "milky glass"