Kvass

Kvass is a fermented beverage made from rye bread that's popular in most Slavic countries.

Where can I buy kvass in Istanbul?

We ate horseradish with kvass.

A sip of invigorating kvass gave him strength.

She […] talked constantly, mostly of her childhood, the young ladies’ school she had attended, and the pleasures of Kiev in the summertime. “Days are long and hot, but nights are languorous and starlit. People refresh themselves in their flower gardens and some walk in the parks, drink kvass and lemonade, and listen to the symphonies […]”