The principles behind this is really simple. To make the tripod as small as possible, make the visible profile of the base as small as possible.
Use only bottles that were for fizzy drinks. Glass Bottles and Bottles for Mineral Bottles should be avoided.
You can tilt up to 7.5 degree before it falls over ( 1.25 L) bottle filled with water
Monopod Length: 1.6 mCamera Weight : 500gBottle Height: 10 cm
The adaptor can fit any monopod with a 1/4 inch or 3/8 inch thread
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https://www.wikihow.com/Sample/Center-of-Gravity-Calculator
https://www.wikihow.com/Calculate-Center-of-Gravity