You should know that breakfast is the most important food you will eat everyday. You are hopefully coming off 8 good hours of rest and consequently 8+ hours of "starvation".
Imagine going your entire work day without taking a single sip of anything. Do you think by the end of your shift you'd slam some liquid? Well, just like with the food, after a nights rest you've done this with hydration as well, and hydration is actually more important than solid food for muscle building.
A German study showed that drinking 16 ounces of water as soon as you get out of bed boosts metabolism 24% for the next 90 minutes. And it is scientific fact that muscles will not grow if they aren't fully hydrated (part of the reason Creatine helps).