Question: how many cups of water should you drink a day nhs?
Answer: Both are American studies that refer to research into the '8x8' rule, which promotes drinking at least eight 8-oz glasses of water a day (1.9 litres). This is much more than the 'about 6-8 glasses' (1.2 litres) of fluid a day advocated by the UK government. Keeping hydrated is important.