In order to survive in the middle of the island, three survival skills are needed.

Correct: In order to survive in the middle of an island, at least three survival skills are needed.

Note:

• The correct article for this sentence is the indefinite article 'an'. If we use the definite article 'the' it will mean that the survival skills we are referring to is only applicable to a specific island. We use the indefinite articles 'a' or 'an' if we are talking about something in general or something that's not specific.

• The sentence is incomplete, I added the expression 'at least'. The expression 'at least' in this context means that there could be more skills needed to survive in the middle of an island but the minimum number of skills required is three.

First of all, Because of the cold temperature, fire is essential to sustain life in island.

Correct: First of all, because of the cold temperature, fire is essential to sustain life in an island.

Note:

• Capitalizing the first letter of the word 'because' is unnecessary. We only capitalize the first letter of a word if it is a proper noun or if it is the beginning of a sentence or after a period [.].

• The sentence is incomplete, the article 'an' is missing.

However, It is difficult to make a fire in island because there is no materials to make a fire so people should rub tree branches dilegently.

Correct: However, it is difficult to start a fire in an island because necessary materials are scarce. In order to start a fire, people should rub tree branches diligently.

Note:

• Capitalizing the first letter of the word 'it' is unnecessary. We only capitalize the first letter of a word if it is a proper noun or if it is the beginning of a sentence or after a period [.].

• It is better to use the verb 'start' instead of 'make' when we are talking about starting a fire.

• The sentence is incomplete, the article 'an' is missing.

• Avoid repetition of words or expressions in the same sentence. Avoid redundancy.

• Always remember to proofread your work before submitting. Double check if there are misspelled and missing words.

Second essential skill is related to make a drinking water.

Correct: The second essential skill is related to purifying water.

Note:

• The sentence is incomplete, the article 'the' is missing.

• Always make sure that you're using the proper word/s to convey your thoughts to avoid misunderstandings. We cannot 'make' water.

People cannot survive without water.

Correct:

Note:

• NO CORRECTIONS
  

In order to get a fresh water, people should use filtering system.

Correct: In order to get fresh water, people should use a filtering system.

Note:

• Water is a non-count noun so the article 'a' is unnecessary in this context.

• The sentence is incomplete, the article 'a' is missing.

By using rocks and sand and muds, people can filter the contaminated water into fresh water.

Correct: By using rocks, sand, and minerals people can filter contaminated water.

Note:

• When you are enumerating, you can use commas (,) to separate two examples instead of using 'and'.

• We cannot use mud to filter water. Mud will only make the water murkier, we use minerals instead. Mud is a non-count noun so adding 's' at the end of the word is unnecessary in this context.

• There is no need for 'into fresh water', for it will be like stating the obvious.

Finally, people in the middle of island should make a residence to stay.

Correct: Finally, people in the middle of an island should make a shelter.

Note:

• The sentence is incomplete, the article 'an' is missing.

• When we say residence, we are pertaining to a permanent house. You should use the word 'shelter' instead. A shelter is somewhere you can rest but it is incomplete, it does not have all the facilities a standard house does (e.g. kitchen, bathroom, etc.).

The weather of island is unpredictable.

Correct: The weather on an island is unpredictable.

Note:

• You used the wrong preposition. We use 'on' if we are pertaining to an island.

Thus, people should concentrate on making a dwelling in order to avoid natural disaster.

Correct: Thus, people should concentrate on making a dwelling that can protect them during an occurrence of a natural disaster.

Note:

• Making a dwelling will not avoid natural disasters. It can only protect us from an occurrence of one.