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No life exists without water and only freshwater is suitable for human consumption. Without food peoples may survive for weeks, but a water loss of 15% causes death in days. Consequently the water is vital for humans. Water content of adult peoples is around 60–70%. At born the ratio is higher, around 80% in infants. The ratio of water decreases over time. In elderly the water content of the body is only about 50%. An average people drinks more than 1000 l fluids per year and body fluids flowing through the kidneys reaches the volume of 2000 l per day. In circumstances of day to day, due to sweating, breathing, excretion and digestion averagely 2.4 l of fluid leaves an adult body. The amount of water necessary to maintain the fluid balance varies from person to person and depends on the physical activity, functions of the body and the environmental conditions (temperature, humidity) (Maton et al. 1993). Table 1 shows the amounts of recommended daily water consumption broken down to by age groups and gender.

The effect of the supply chain exerting physical stress on the microbiological status of bottled natural mineral water