Ask MeCha: Is there a lo-fi version of this? →[More:]I've always wanted a nice, basic water bottle that I can keep at my desk and that somehow tracks the amount of water I comsume in a day.

I've often thought of just keeping a post-it note near my cup and marking down in hatch-marks to see how close I get to the recommended 64 ounces, but I'd prefer something more reusable (hypothetically, say, a bottle with a dry-erase panel where I can mark down how many times I've refilled).

Though cool, the hydracoach is a little too fancy for me. I am not beyond hacking my own solution. My husband just suggested I hot-glue my knitting row counter to my favorite bottle. Any other ideas?