Do you have a hip pack? If so, why not use that instead of adding a chest pack? Pack the Camelback to hold your water and put it down when you're not on the move. If not have you considered one of those, then use both? Not trying to persuaded you away from something you prefer, just sharing experience. If you think you can make a chest pack work, go for it!
If you have a hip but don't have a bottle holder, you can get a caribiner with a ring to hold a bottle or one of these.