There are many steps but they are simple if you have the basic sewing skills.
Its useful and handy DIY project for those that can relate.
Draw your measurements onto the white paper to use as a template to trace out onto your fabric.

Image by 手作diy HandyMum Lin TV via YouTube
Next, continue to watchdiy HandyMum Lin TV tutorialon YouTube for full instructions and details.
Plus, its very cute to slip your bottle in the bag to carry it around your wrist.

