Microbiologically safe and healthy drinking water is prepared from raw water by clarifying and disinfecting it with reactive oxygen derivatives and silver ions. Initially, the water is treated with ozone until a suitable concentration of 0.1-0.5 mg/l of ozone in the water is reached, after that the required amount of silver cations disinfectant solution is supplied into the water so that the silver concentration is 0.02-0.1 mg/l. A stable and safe silver disinfectant solution is used without the use of electrolysis equipment. The solution is stabilized with alkaline earth and/or alkali metal cations, which positively complement the overall intake of minerals. By using such a method, the water stored in the open is protected from secondary microbial contamination for a long time, particularly, longer than 3 months.