Most commercial bottled water comes in plastic bottles that are largely, if not entirely, immune to freezing. It is a packaging design consideration. Manufacturers and shippers don't want a semi-load of bottled water to be destroyed if the temperatures drop or the truck reroutes through a mountain pass that gets frosty. Those corrugations in the bottle are aesthetic and allow a good grip, both worthy goals, but they also allow space for the water to expand into if it freezes.

There may be brands of bottled water in plastic that may leak or burst if it freezes solid. But I haven't seen any. I've seen quite a few frozen bottles but none burst of leaked. An interesting experiment is to take various bottles of water and place them in a freezer to see what happens.

You might want to protect some of your water to keep it from freezing so you have some ready to drink when you need it.