Reduction for bottle cap

OK, so I bought a titanium watter bottle from [AliExpress](https://www.aliexpress.com/item/1005004536354014.html?pdp_npi=3%40dis%21USD%21US%20%2452.88%21US%20%2447.59%21%21%21%21%21%402103254116984955118194753e46de%2112000029512431411%21im%21%21) and I wanted to use it with my [hydration system](https://www.ortlieb.com/en_us/drinking-tube), which has standart european PET cap.

This is the result - both screws are rather eyballed to fit using the [thread library](https://dkprojects.net/openscad-threads/) under GPL.

I still need to get some silicone o-rings as seals and of course make everything food safe (perhaps some resin coating, which could affect the size).