Available in any colour variation to suit your personal style. 
This will (as you can see in the second picture) hold up to a three litre bottle securely. The belt fitting is brass and the clip is aluminium.
There's not  much more I can say about it other than if you prefer your bottle to be quicker access than inside a pack or bag, give this a try. 

*Note, will not fit wider screw top bottles* Neck width is fixed

water bottle holder. EDC, Every Day Carry Leather, brass and Aluminium.

Alu clip colour