From my opinion, I like the way that the poet can make me feel how vast the ocean is. He repeats the word ‘water’ over and over again. Moreover, he can show me how thirsty the sailors are. At that moment sea water is everywhere, but drinking water is nowhere. Another paragraph that I like begins with ‘Day after day, ...". The poet can also help me imagine just how still the ship was. Undoubtedly, I can see a picture of a ship stand still in the vast ocean forever.
If you have any other views on this poem, you’re welcomed to share. There is no ‘right’ or ‘wrong’ interpretation. This is because a single poem may have different meanings for different people. Sometimes, we hardly understand what the poet is trying to tell us, do we? So, just take it easy and express only what you can see.