Two bottles holder. I have always problems with space on motorcycle. And when I am finally fully packaged, then I realize that the water has to go somewhere ;).
Originaly designed with coca cola bottles 1.75l. But it should work on others 1.5l bottles.
You will need some straps and lock to complete it. I cutted it from some old bag.
I can confirm functionality, I did with it about 10000km. :)
Be aware of that, that air bubbles in the bottles can act as magnifier. It's good idea in sunny days to cover it with something or use non transparent bottles. I personally covered my bottles with ALU tape.