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.
Since then, The British Dietetic Association has declared that an average adult should drink 10.5 cups of water per day. Also, the Journal of the American Dietetic Association says the average sedentary man should drink 12 glasses of water a day, and the average sedentary woman 9 glasses per day. The truth is water is an essential nutrient for life.