First time trying out. If it works, will carry on building more of these. The construction is rather simple, all you need are few water bottles, disposable chopsticks, straw and strings.
Before filling soil, squeezed some tissue at the bottle neck, this will prevent the soil from coming out of the drain hole.
Lower drainage to pot
Mid drainage, I had made 3 holes instead of one
For the self-watering bottle, I made a holder using clothe hanger and bend it to shape. I am still experimenting the size of the drain hole. Currently on the bottle cap I had drilled 3 holes of 2mm dia.