Workout question!!!!!! i drink 2-3 gallons of water a day is that healthy?

im a 20 years old male, 6'1,weight: 240lb. 16-19% of body fat. i workout monday-thursday for three hours and sometimes workout twice a day but only for 1 hour. than i work at winn dixie which means im walking around alot and on my feet for 6 hours str8, but only on the weekends. am i active enough or is this dangerous...