Do you want ______ glass of milk?

Let's consider the usage of the given determiners- many - It is used to indicate countable plural nouns, which are not counted.Another - It means one after the one already discussed or used.more - It is used as an adjective to indicate excess quantity.each - It is used as a distributive adjective or distributive pronoun.Hence, according to the context of the sentence, another will be the correct answer. ​