My daughter's bicycle came without screws to attach water bottle holders. So I custom designed and printed these clamps which let you screw in a regular bicycle water bottle holder (eg. Aluminum).
These clamps designed for an Oval-ish bicycle frame (see photos) and the top and bottom parts clamp together using standard M2 screws and square nuts. Fusion 3D files are provided if you want to customize.
The author hasn't provided the model origin yet.