Yeah I have a bottle launcher.. And it does occasionally. It's a profile design. I have one bottle holder on the down tube then the launcher on the back. I keep a water bottle filled w/ my tire changing stuff on the back and I haven't had it launch yet. But the other day I had an empty bottle launch out of the other side. I think I mostly have problems when the bottle is empty. I use just about every set up possible. I do use a camelbak for my water. I have a nice one that vents pretty well so even in the AZ heat it doesn't bother me. I also have an aerobottle that fits between my aerobars. It has a loonnng straw so that I can just take a swig when I'm down in the bars. It's nice but can get messy on rough roads. It just has a sponge thingy in it instead of an actual top, so the liquid can slosh out. It's nice for on the fly filling though. Usually I carry two bottles of my cyto/carbopro cocktail and just refill my aerobottle.
They also have a never reach system. It's a big plastic bladder that mounts on the back w/ a supppperrr loooooooooooong tube/straw that goes along your top tube and mounts on your bar. You then just take a sip whenever you want. It kind of seems like a good idea, but kinda strange at the same time. Some guys say it looks like a urinal??
There are lots of choices out there. I guess you just have to figure out what works for you. Good luck!
denise