Buy food and drinks from cheap supermarkets like Billa, Lidl, Kaufland. For example one bottle of water 500 ml is 0,25 leva.
About the transport you can buy a card for the whole day — is cheaper than one way ticket
We got information about prices in Sofia on food in cafes and restaurants, products in supermarkets, accommodation rental, real estate and transportation costs based on the data of 11 people.
We analyzed the average prices in Sofia and calculated that one day in city will cost you 72 Bulgarian levas.