I made this handle so that the bottle could be used one handed if necessary. The bottle can be a bit heavy one handed, and this makes drinking out of it a lot easier and works good as a carry handle too. It's extremely sturdy.

You will need to print two rings and then the handle. The rings slide over the bottle. If you can't get the rings to push into the handle, put the rings on the handle first, then slide the rings/handle over the bottle together.

I used 4x M4x30 Socket Head Screws and 4x M4 Nuts to bolt the handle onto the rings.

If you are using a similar bottle type you should be able to just scale the models to fit. The ID of the rings is 4.84"