Bear Grylls Water Bottle - Canteen

Bear Grylls makes use of the NATO Canteen, also known as Water Bottle, and it's stainless steel canteen cup named "Crusader"

This one is expensive, so a more common item is the American type of Canteen and it's stainless steel cup.

Both are available on Amazon.com

Rothco Aluminum Canteen and Cover

Stainless Steel Canteen Cup

Quart Olive Drab Plastic Canteen