Good riddance!
The single-use plastic bottles (of tap water...Dasani, Aquafina, etc) are an absolute pestilence on the environment. I'm not going to go on a tirade and say everyone who are drinking these in American hotel rooms are part of the problem, but...
When traveling internationally, in some places tap water isn't suitable to drink, so bottled water is certainly a necessity at times. In most developed countries, plastic bottled water is unnecessary and incredibly wasteful.
I always travel with a large, refillable water bottle in my carry-on. You may have noticed, in the last 3-4 years, nearly every major American airport has installed filtered water refilling stations above the drinking water fountains (usually located next to the restrooms).
Once at the hotel, to fill up my personal water bottle, I always hit up the fitness center, as they'll typically have a filtered water dispenser. You can also check the hotel ice machine, as many ice machines have a water dispensing faucet built in, since ice machines already filter their water for the ice cubes.
In most of their Hawaiian properties, Hyatt forgoes bottled water in the room completely, leaving instead two, new refillable water bottles. I love this. On top of that they have filtered water dispensers located throughout the property to conveniently refill throughout the stay.
My environmental footprint is already bad enough while traveling, so if I can keep an additional 3-5 plastic water bottles each day out of the landfills/oceans, ^