Echo Three Colourfuel Colour Changing Drinks Bottle This colour changing water bottle is perfect for staying hydrated and impressing your friends when you are out and about. Watch as the water splashes around the bottle with mesmerising effects on the outside or fill it slowly and watch the white bottle turn blue as the water rises from the bottom. Once the bottle is blue apply the heat of a handprint to create cool effects. This lightweight bottle holds 600ml of liquid so is an ideal gift for anyone who is constantly on the go. A perfect present for Christmas or a birthday.