He's explaining what open-world gameplay means in the context of the Metal Gear universe, and Kojima uses the water bottle as an anchor. It's a way to explain how The Phantom Pain is open ...
The Metal Gear Solid games span across decades, though not in chronological order. This should clear the timeline up.
After the release of Metal Gear Solid 4 in 2008, Konami wanted to ease their development process for future games. They ...