This video is from youtube. I like how you can see the bees drinking with their tongue. Also this is typical how bees find water and drink. The bees find water then tend to congregate in the same area in mass. Also There are two races of bees here. Carniolans and Italians.
A Carniolan flies into camera at :30 and at :46 there is a beach of Carniolans. They have a Grey color to their abdomen instead of Orange like the Italian.