Soda Bottle Water Clock

How to make a Sand clock style Water clock. 350mL bottle = 10min 30sec.(water), 14min(83% ethanol) @ 22℃ Ethanol is higher viscosity than the water. So Ethanol takes more time. The viscosity changes depending on the temperature. Therefore, time is also varied depending on the temperature. 500mL bottle = 16min. Water, @ 22℃