It is better to spread your consumption out over the day. I notice that if I drink a large glass first thing in the morning, I want more water throughout the day. If I miss that 1st glass before I go to work, I tend to forget to drink all day long. Weird, but it's just something I've noticed.

At home I drink tap water. We have great tasting water where I live.
At work I have the luxury of a water cooler.

Keep hydrating!