Water

Hi! I read the RS new letter and noticed the tip on not storing water bottles in the car. I keep a emergency kit in the back of my van (water, first aid kit, space blankets, chocolate ect.) Although I had heard this about water bottles before, I still have some in there because I don't really know what else to use. So I'm hoping you can give me so other ideas for emergency water storage for the car. Thanks You're The Best!