Hi Laura,
If I did my math correctly, 3 liters of water converts to the same as 12.5 eight ounce cups per day. [1 liter = 1000cc and 1 cup = 240cc] No, this amount is not too much water.
Unfortunately, there are people that have died from drinking way too much...and we are talking gallons at a time. We had a teen in our state that took the illegal drug 'ecstacy' that passed away. The kidneys can't work properly when there is too much. The drug causes extreme thirst...but a 'normal' person does not have to worry about drinking too much.
Oops, my nursing is coming out in me..

Soooo....keep drinking that wonderful water, it truly helps with the weight loss.
TOPS hugs,
Summer