Outlined below are some other examples of advice from various authorities regarding the recommended daily intake of water.

*The UK Food Standards Agency recommends: "In moderate climates, such as the UK, we should drink at least 6 to 8 cups/glasses of water (or other fluid) to prevent dehydration. In hotter climates your body will need more fluids. This is quite general, especially since the sizes of cups, mugs and glasses could vary considerably. In a personal communication the FSA clarified that by 6-8 cups/glasses they mean approximately 2.5 litres per day for the average person. They note that "requirements for individuals will vary, and fluid intake should increase in warm weather, or to combat losses through exercise". In addition, "a smaller person will require a proportionally lower quantity of water"; however, they have not made specific recommendations for this.

The advice from the British Dietetic Association is: "In a moderate climate like ours, most of us need around 6-8 glasses of fluid a day; for example, water, milk, fruit juice, tea or coffee, to keep the balance right. However, if we have sweated a lot, because it's hot or we've been exercising, our requirements increase; a good guide is to have an extra one litre of water for every hour of strenuous exercise.

The World Health Organization states that "the 'absolute minimum' quantity of water to sustain hydration remains elusive, as this is dependent on climate, activity level and diet". WHO notes that some hydration needs are met through fluid obtained from food, however they disregard this contribution in their recommendation of daily water requirements, because, on a global basis, "the proportion of fluid obtained from food may vary significantly in response to diet and culture from negligible to all hydration needs". They note that allocating the full hydration component to drinking water alone may over-estimate the quantity of water required, but "this is believed to be no more significant than the variation likely to occur due to activity levels and temperature." The WHO recommendations for daily requirements of drinking water are given in the table below.