Oh, the joy of being retired and able to fiddle-fart around for an entire day. Here is my amateur bottle holder project, and it turned out pretty decent. I used the same rivets I have for making new toe straps, and a slick little tool that cuts leather strips.

I'm no tri-athlete, but being in Florida it never hurts to have a lot of water...plus I like things balanced. The wing nuts are temporary, since they may clank against the seat rails. I'll search the hardware store, or Tandy Leather, for something less protruding.