Is a nourishment drink a subtitute for breakfast?

It depends: What is the specific "nourishment drink" you're considering? You need to have protein, healthy fat, fiber, and some fruits or veggies in it, with low sugar content too. It is possible to make some good shakes or smoothies with such contents at home, but the ingredients are important.

Just eat breakfast.: Healthy living would usually entail eating whole healthy foods, not replacing meals with drinks that are supposed to be meal replacements. It's healthier to eat real foods for breakfast, which is really the most important meal of the day.