Mezonic AS is part-owner of the US firm WOW Gear. They produce drinking cups for children and drink bottles that are 100% waterproof, and can be purchased at Boots Pharmacy, or on Amazon.
To test how durable the drinking bottles are, they filmed a 4-ton Ford Truck running over the water bottle. The bottle is pressed almost flat, before bouncing back to original shape. Then they fill in water, and see that it is waterproof even after it has been run over by a car!
In Norway you can mainly buy the children's cups, while amazon.com sell all the products with shipping to Norway.
Check out the video here.
Check out their Instagram page here.