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Growing a coconut in a pot tends to be a short lived plant.
Here is a link with growing information.

https://www.gardeningknowhow.com/edible/fruits/coconut/growing-coconut-palm-trees.htm

Approx 3 gallons a week, but this will vary depending on the size of the tree, soil conditions and humidity.

https://www.gardeningknowhow.com/edible/fruits/coconut/growing-coconut-palm-trees.htm

This sounds like an issue with pollination. Where is this tree grown - indoors or outside? If inside, you should move it outdoors to make the tree more accessible to pollinating insects and wind, which is its normal means of pollination, or you could try to mimic the wind by placing a small fan nearby (on low setting) to move pollen within the tree. If the tree is grown outdoors, you may need to try hand pollinating. Just use a small paint brush and swirl it around the inside of the flower and repeat on all the flowers on the plant.

Plant the fresh coconut point side down.

Here is a link with more information.

https://www.gardeningknowhow.com/edible/fruits/coconut/growing-coconut-palm-trees.htm

This appears to be a case of Thielaviopsis trunk rot which is a lethal fungal disease that causes one-sided trunk rot and the collapse of the trunk or crown.
This disease requires a wound in the soft trunk tissue. There is no treatment for this disease.

Here is a link that explains this disease.
http://edis.ifas.ufl.edu/pp143

This article will help you:
https://www.gardeningknowhow.com/edible/fruits/coconut/coconut-tree-problems.htm