Ollie [ol-lie] as a boys' name (also used less generally as girls' name Ollie) is of Latin origin, and Ollie means olive tree. Ollie is a version of Oliver (Latin). Associated with: tree.
The Takeaway. On average men need 3.7 liters of fluids per day, and women need 2.7 liters. All fluids count, including milk, juice, coffee, tea, and even water-rich foods. Thirst and urine color might be better guidelines for staying hydrated. Weather, activity level, illness, and age can all impact water needs.
The advice to drink at least two liters of water every day seems to be a piece of common knowledge that everyone knows, isn't backed up by studies, as far as I can tell. My own theory is that sailors discovered by trial and error that they needed a gallon of water daily to remain in good health.oodstuffs that have high moisture contents also contribute to our water supply. With our food we absorb about 1 litre of water a day. Our total required amount of water is 2,5 litres a day. If we drink enough water and eat enough water-containing food, this should not be a problem.