If a bottle holds 500mL of fluid then 375mL of liquid will fill a little less than 4/5 of the bottle. This means that if the bottle was divided into 5 sections (with a marker) that held equal volumes of liquid(use water) then the water would be just a little lower than the fourth marking on the bottle. However, the easiest way to know for sure where the 375mL mark is, would be to measure 375mL of water in a graduated cylinder and pour it into a water bottle that holds 500mL of liquid.
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