I find it easier to drink lots of water while at work. It is difficult to remember to drink water and if I drink more water, I will use the restroom at least once every hour.

Thankfully, I've yet to work at a place that prohibited employees from going to the restroom every hour. If they want to check if I am really using the restroom, they're free to do so I guess (although I would start looking for a new job if this were the case).