In Soviet times, yellow tank trucks sold kvass on street corners from Moscow to Kazakhstan, often with a single shared glass rinsed between customers.
Rye bread is fermented into a lightly fizzy, faintly sour, barely alcoholic drink, sold ice-cold from tanker trucks and roadside barrels through the summer months. Petropavlovsk and other northern Kazakh cities near the Russian border keep the tradition alive with vendors setting up curbside taps as soon as the weather turns hot.