title_body: Is there a drink in Italy similar to kvass?
upvoted_answer: Your best bet is likely to be a Russian/Eastern European store. There are some in many larger Italian cities, search for "negozio russo" or "alimentari russo" in an area you are interested in. Some possibilities:
  
  Rome
  
  
  "Kozak" - Via dei Conciatori, 1c
  "Galychnya" - Via Santa Maria delle Fornaci, 6
  
  
  Verona
  
  
  "Il Negozio Tipico Russo", Via Vincenzo Cabianca, 10
  
  
  Cagliari
  
  
  "Алёнушка" - via Francesco Carrara, 22
  
  
  Genoa
  
  
  "Angolo dell'Est" Vicolo Canneto il Curto
  
  
  Carpi
  
  
  "Europa-Est" - via Trento Trieste 34/a
  
  
  It may pay to call ahead to see if they carry Kvass, if you can find a phone number.