Although 8 is not a word, I will assume you mean "eight".
The words eight, water, ink, and fried are likely related to the word "octopus".

To explain the reasoning behind this, I will do a play by play:
Before analyzing the words, I know by your rules that the given words must be related in some way, and that each word in succession will reveal more about the target word.
Thus, each word on their own will reveal little about the target word, however when the words are viewed together they act as features which can be attributed to a host of other words.

Now, when analyzing the words, I first see the word "eight", which on its own does not mean anything yet.

I then see the word "water", which when combined with the previous word "eight", tells me the target word is some object or conceptual term which involves eight and water.
Next, I see the word "ink", which when combined with the previous words "eight" and "water", tells me the word can no longer be a conceptual term, such as a water surfing race. Instead, because of the word "ink", the target word must be an object, such as a pen or animal. From this we can see already a trend towards animals.

Lastly, I see the word "fried", which when combined with the previous words "eight", "water" and "ink", tell me that the target word can no longer be a non-human edible object. Thus, since we know the target word must be an animal, we can narrow down a specific animal. The only animals in water that involve ink are squids and octopi. However, because of the word "eight" we know that it cannot be a squid as, although both squids and octopi have eight limbs, the squid has two additional tentacles.

So to finalize, the word must be "octopus", or "octopi", the plural in this case is less likely to be correct simply by human tradition or habit where the plural is used less often, although both words are very close in likelihood.
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