Ok, I'm getting a bit ahead of myself but I've seen lots of shots and talk in magazines about how good waterbottles on the front of the bike are for long distance rides, HIMs and IMs as you can stay in the aero position and drink. But.....from the look they only hold a litre or so. What do you do when they run out and have to use the other bottles on the other mounts? Is there an easy way to refil them or do you just have to give up your aero position and drink sitting up from the other bottles?