I have tried two kinds of the insulated Camelback bottles as well as one of the Polar insulated bottles. I find in hot weather they only keep my drinks really cold for about 60 minutes or perhaps 90 if I put ice in them as well (which I prefer not to do as the taste isn't as good when the ice melts).
I was thinking of trying to 1/2 fill the bottles and freeze them overnight then top them off before I ride. Is this OK on these types of foil insulated bottles and more importantly DOES IT WORK?