It's AumSum Time. How does Water get inside a Coconut? Simple, I put it inside using Magic. Oh AumSum. To buy AumSum merchandise visit AumSum.com. Firstly, roots of the coconut plant absorb water from the soil by a process called osmosis. This water is then transported to different parts of the coconut plant. Some of it reaches the coconut. The liquid which eventually reaches the coconut is referred to as the endosperm. This endosperm acts as the food or nourishment for the coconut's growth. Now, a part of the endosperm gets converted into a creamy tissue And gets deposited on the coconuts inner surface. Over a period of time this creamy tissue turns hard. And the remaining endosperm ends up as coconut water. So this is how water ends up inside a coconut.