No, they don't cost nearly as much as a single bottle of water. I buy bottled water in bulk.
I also use a reusable plastic bottle. I don't have it with me all the time.
Bottled water is like SUVs and large homes for upper middle class people. People get irrationally pissed about them and ignore much more important things related to the environment, like single pane windows and other poor insulation. The difference between an SUV and a prius is small compared to the energy lost in a poorly insulated home in New England or Arizona.
[edit: don't forget to account for the energy of washing the reusable bottle. I've heard for a ceramic mug you need to use it 1000 times before it uses less energy than 1000 styrofoam cups]
I also use a reusable plastic bottle. I don't have it with me all the time.
Bottled water is like SUVs and large homes for upper middle class people. People get irrationally pissed about them and ignore much more important things related to the environment, like single pane windows and other poor insulation. The difference between an SUV and a prius is small compared to the energy lost in a poorly insulated home in New England or Arizona.
[edit: don't forget to account for the energy of washing the reusable bottle. I've heard for a ceramic mug you need to use it 1000 times before it uses less energy than 1000 styrofoam cups]