I've recently seen fanny packs with bottle holders on them at Target.
I bought a bottle strap at disney a few visits ago and thought it would be great - but both my husband and I really don't like it as much as we thought we would - as we walked the bottle banged against us and when the condensation formed on the outside, it left a wet mark where it touched us - which I suppose is nice when its hot but we tend to go to Disney in October and November.
Sorry this didn't answer your question, but I thought I'd stick my 2cents in anyway.