Take your weight then divide by 2. That is the min. number of oz. you need of water.
120 ounces is not too much water. Everyone in the nation should drink that much water rather than some of the other choices out there.
Same here i normally drink 8 glass a day or 10 glass.
You only have to drink enough to stay hydrated. Typically, it's recommended that you drink 8 - 8 oz glasses of water/day, but doctors are now saying that's not necessary. Remember that the food you eat, also contains water, plus other beverages count toward your intake.
Drink the amount that you're comfortable with.