DogProducts - Drinking water

Has acid and polluted rain so ruined our puddles and streams that dogs shouldn't be allowed to drink where they can? On the other hand, our urban parks are pretty darn dry. Especially for hot days or long walks, there are solutions:
Handi-drink - bottle with cup
Pupcups - cupped water
Cool Pooch - bottle with bowl

But why not just use a thermos or carry a water bottle and a bowl?

Image is by William Eggleston, posted on Salon. Salon article on William Eggleston