The ways to check whether the coconut water is bad are:

1. Look at the color of the coconut milk: fresh coconut milk is milky white, thick, rich in oil and fragrant. If the coconut milk has gone bad, it will have a strong sour taste and the juice will be solidified, so it is not suitable for consumption.

2. Put the coconut to your ear and shake it to hear if there is any sound of water. If there is a sound of water, it means that the coconut is not tender or has been stored for a long time. If you choose such a coconut to drink water, you will not be able to taste the natural fragrance.