you have to include the effects on yourself as well.so in the case of the bottled water you don't have to drink poissoned water instead of bottled water in order to act morally.
Everything we do impacts on others, tracking small and arbitrary infractions and calling that morality is a far greater wrong than a less CO2 efficient source of water. Just cap and trade already, I hate these taboo based social manipulations.
"cause harm to others" is such a loose phrase you could drive a bulldozer through it. It could encompass everything from flatulence to the use of Weapons of Mass Destruction.
I'd tighten up that language a little bit if you are trying to make a point.
