I don't know of any way to have your water consumption recorded on the overall nutritional reports. Are you clicking on "Today's Full Report" at the bottom right side of the Nutrition Tracker, and hoping to find a way to show your cups of water along with your daily food details, breakdown and percentages? I don't think it's possible.
However, there are a few places you can see a summary of water consumed (over time) under the "Reports" link on the drop-down menu under "My Trackers." I track my cups of water in my "Other Goals" list; but I assume as long as a person posts them at the top of the Nutrition Tracker, they will show up in the Reports' section.
From what I was able to find, there are adjustable bar graphs for water in "Reports" under "SparkPeople Special Goals," and also in "Quick Track." The "Spark Summary Calendar" is very useful; it lists daily totals in a monthly calendar form, such as exercise minutes and calories eaten. I thought it included cups of water, but I was wrong.
HOPE THIS HELPS!