yes good idea I probably should. The bumbag at sweatybetty had an elastic strap to hold it in place then enough room for light waterproof, keys, mobile etc. They also had plastic bottles for £5 but I bet I could get cheaper... Actually I have started running as I'm doing a charity race, I wonder if they give a free one out(bottle that is).
I got the bumbag thing with a water bottle for (I think) about £6. I got it for dh when he was going on a walking holiday- it was a karrimor one and the rrp was over £20 so it was a real b argain. Well worth a look!