I have a women's bike that only has room for one water bottle and you cannot reach it while you are riding. When I am riding with slower people, I always stop and wait for them so there is no problem getting a drink. When I am riding with faster people, I can't stop for a drink (because they don't stop) and if I do, I lose them and can't catch up.

So a few weeks ago I bought a Camelback water bottle that is made of hard safe plastic with a bite valve. It comes with a loop hook on the top. When I asked my husband (engineer) why there is a loop sticking up, he said maybe it's for hanging the bottle somewhere. So, he made a wire hook and attached it to my bike stem and the bottle just hangs there right in front of me at a place where it is easy to get. I still wait till I am riding pretty straight and level, but now I can get a drink. Yeah!