## 1 Introduction  
The sustainable development of each country determines the quality of human life and health, which depends on the level of economic development [1, 2], the state of the environment [3, 4, 5, 6, 7, 8, 9, 10], the quality of food and drinking water [11, 12, 13]. Mineral waters are mineralized subterranean or surface waters which have specific physicochemical properties (temperature, radioactivity, etc. ), are enriched with biologically active substances and have medicinal qualities. Water is medicinal (healing) if one liter of water contains at least 1 g of mineral substances, and treatment with such water is called balneotherapy. Water must be highly potent or have a high temperature [14, 15, 16]. The physical and chemical properties of water include temperature, mineralization, ionic composition, dissolved gases, radioactivity, biologically active compounds and trace elements [17, 18]. By temperature, mineral waters are classified as follows: very cold (up to 4 \({}^{\circ}\)C); cold (4-20 \({}^{\circ}\)C); warm (hypothermal) (20-37 \({}^{\circ}\)C); hot (mesothermal) (37-42 \({}^{\circ}\)C); very hot (hyperthermal) (>42 \({}^{\circ}\)C). It was found that medicinal waters, when passing deep into the soil, dissolve its salts and get enriched with them, especially in those cases when the water is retained for some reason and becomes motionless [19; 20; 21]. Mineralization of water is determined by the content of the total amount of dissolved mineral substances. The following water groups are distinguished by mineralization: very low mineral content water (light mineral water) (2 g/L); low mineral content water (2-5 g/L); medium mineral content water (5-15 g/L); rich mineral content water (15-30 g/L); saturated (30-150 g/L); oversaturated (>150 g/L) [22; 23; 24]. Very low mineral content water and high-calcium water has diuretic properties, and this contributes to the removal of bacteria, mucus, sand and small stones from the body along with urine. According to the content of excess salts, mineral waters are divided into hydrocarbonate, chloride, sulphate; combination of hydrocarbonate, chloride and sulfate waters--medicinal waters that contain biologically important ions, such as iron or arsenic [25; 26; 27]. Gas containing mineral waters contain gases in a dissolved or free state. If the water contains carbon dioxide or hydrogen sulfide, it refers to a healing water for a specific purpose. Water may also contain nitrogen, methane and other gases, but currently such waters are underexplored and not fully understood. Mineral water may contain comparatively large amounts of the decay products of radioactive substances, such as radon and helium, and radioactive metals: uranium, thorium, and actinium [28]. If the content of radon and helium is more than 1/10 of the volume of water, then the water becomes industrially significant [29; 30; 31]. On the territory of Georgia, more than two thousand springs have been discovered, including more than 730 springs of mineral waters, the daily volume of which is 130 million liters, of which a quarter is used for balneological purposes, more than half is used in heat supply and industrial bottling. Famous mineral healing waters include:  
* Borjomi--Medicinal-table hydrocarbonate sodium mineral water of medium mineralization. The springs are in the Borjomi Gorge, in eastern Georgia. Unlike many other similar mineral waters, Borjomi does not have time to cool underground and comes to the surface warm (38-41 \({}^{\circ}\)C), the water \"undergoes\" natural filtration and is enriched with 60 different minerals, which make its composition unique. The mineral water treats the digestive system, diseases of the gastrointestinal tract, biliary ducts, kidneys and much more [32; 33; 34; 35; 36]. * Likani--A unique natural medicinal-table water, saturated with minerals, contains a mineral-ion complex--a combination of magnesium and calcium hydrocarbons. Likani is richly saturated with natural gas, therefore it perfectly quenches thirst.