I keep 2 1-liter bottles on my desk at work (I wash them of course!). Each morning I have made it a priority to fill them from the water cooler before I dive into my day. I keep them right on hand and sip throughout the day; if they both need washing by 5pm, I have HIT MY GOAL to drink at least the 8 glasses/day... it's a great feeling of accomplishment when I head home for the evening.
TIP---for those Spark members who are in the New England area---I also LOVE Polar brand seltzer waters. I buy them by the case in 1 liter bottles. No calories, sodium, or artificial flavors/sweeteners. They come in a huge variety of flavors and right now I am partial to Banana, Cinnamon, and Boston Cream Pie!