I would think that there would be a problem if you didn't spend time in the office bathroom but I'm sure that if you drink that much water...it's your second office, so don't worry.
Do remember thought that you might need to lower your intake as you lose weight, but your body should be able to let you know it had enough and to stop drinking...by making you not thirsty.
Be aware of any changes in your water intake vs going to the bathroom, water intake vs food (especialy the salty stuff), water intake vs your body for any weird changes that don't feel right.
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