The drank Soma (http://en.wikipedia.org/wiki/Soma) and psychedelic mushroom beverages that were out of this world.
Good thing they didn’t have cars or else the host would have to take the keys away from everybody.
Soma was made from a plant that doesn’t grow in the Indus Valley, too wet and hot down there. Soma comes from Afghanistan, is still used in traditional medicine, and turns the water a kind of pink color when steeped.
Soma isn’t known to have arrived until the Aryans arrived from Central Asia and brought it (and the literature about it) with them.