Pre-filled plastic bottles have now replaced these but, during my childhood this was seen during all train and bus journeys.
The following image is a caricature of an Indian politician with two yes men behind him.
Yes men are till today called Koojas in Tamil Nadu as they used to carry water for their bosses in such vessels.
In Hindi and other North Indian languages, they are called chamchas the original word still used in regular conversations means a spoon.
Have you ever been a kooja/chamcha or had one? I have both.