This is a bit old, but nevertheless worth a mention again and again...
SPCA says NO to water bottles for dogs.
The SPCA has come across a number of dogs owners using water bottles for their animals. This is probably because they saw them being used in the pet shop and think that this is the right apparatus for a dog to drink water from.
The SPCA would like to emphasize the importance of dogs having access to a decent supply of water which is readily available. Water bottles require considerable effort for the animals to actually quench their thirst. In our tropical climate, it is just not acceptable from SPCA's standpoint, that dogs have to lick continuously on a water bottle in order to obtain droplets of water. A water bowl enables them to lap a more generous amount, thereby fulfilling their thirst without considerable effort.