After having a bad experience ordering a camera lens from Japan, I decided that I won't be anything from over that way ever again. But thanks.
Single bad experience trading with Japan = won't buy anything from a country 1300 miles* away even if the item is barely more than the cost of a stamp? Wow. You hold a grudge!
I thought that at £1.98 for a cage and a mount for the bars you could solve your problem of where to put the bottle and get a perfectly functional bottle holder all for a bus fare. But if you want to spend 7 times as much on something that does the same job that's up to you!
Good luck not buying anything made in China though, you're going to need it
* capital cities are 1300 miles apart.