Are you really cheap like me? Can't afford $9 for a water bottle holder? Then make this, out of a coathanger.
You will need.
some various screws and washers
2 pliers (I used pliers and channel locks, just what I had near my desk.
Drill and drillbit
Ok, you will need about 20 minutes to make it, and 10 to install it.
Step 1: Get your stuff and start bending
First, I find it easier if you take your coathanger and make it straight, that way there are no confusing bends to wrap your mind around.
Then find a style of holder you like on the internet, I chose this one. (see photo