How to get coconut water out of a coconut easily with a cork opener?

You probably love coconuts, especially coconut water. But you may also feel troublesome when thinking about opening a coconut to get the water. To open a fruit, we can always use opener which is meant to open other things to alternatively open a fruit. Such example is like opening a coconut to get the water using a cork opener. Here's the video I found on Youtube on how to get the coconut water by just using a cork opener.