You will need 2x M3x8mm Screw and 2x M3 Heat Set Inserts that are about 4mm long or less. First you need to push the heat set inserts into the bottle handle using a soldering iron, I also added a bit of red thread locker but it might not be necessary. Then you need to align the pins as shown in the photos and then screw them in tightly, after that, just slide the handle's pins into the slots of your water bottle cover and you are done!
Prints without supports
Materials Needed:
The author marked this model as their own original creation.