(Reuters) - Polish and Czech drinkers will face bigger bills for vodka with Stock Spirits planning to hike prices because of proposed increases in excise duties in its two biggest markets.The Czech Republic proposed a 13% tax rise on spirits and gambling to boost the state budget revenue by 1.3 billion Czech crowns ($56 million) in 2020. Poland has proposed a 10% increase in taxes on alcohol from January 2020.Stock Spirits relies on Poland and the Czech Republic, where the company sells the..