This is the reason why you begin with a mixture of milk and water; otherwise you will end up with a very thick drink that won't be as soothing. (articles.mercola.com)
You could skip this step if you wanted, but you will probably find this to be a slightly thick drink. (houseofyumm.com)
The sipper straw is definitely best for thin liquids (water, juice, tea, etc.), but both the ice tea and smoothie sizes work well for thicker drinks. (femfusionfitness.com)