Some of the common formulas given for the amount of water to drink every day are, eight 8-ounce glasses a day (64 oz.), and half your body weight in ounces. Other recommendations are 3 liters a day for men (101 oz.) and 2.2 liters a day for women (74 oz).
For an adult male, 64 ounces is probably not enough. Going by the half your body weight in ounces formula, 64 ounces would only be sufficient for a 128 pound man and the average man weighs well over that amount. Thus, the 3 liters a day or the half your weight in ounces recommendation is probably a better estimate of what most people need.
If your urine is not very light yellow or clear then you need to drink more water. It takes 33 glasses of water to detox one can of soda. Thus, if you drink soda it would be extremely difficult to drink enough water every day.