Thank you Logan for doing and submitting your homework. ^_^

1.We can`t live with water.
Correct: .We can`t live without water.
>> Can't is a negative word, please also use the negative form of with ( without ).

2.Dont waste the water.
Correct: Don't waste the water.
>> Don't forget to use apostrophe when you want to shorten the words " do not, does not '.

3.We can breathe.
CORRECT!

4.Korea have water resources.
Correct: Korea has water resources.
>> Singular subject take singular verb.