“i can drink that straight as if it was water” means that he/she can drink that particular drink like they drink water. like with the same reaction with which they drink water
When elaborating a persuasive essay, you should try to anticipate the reader's objections to your argument and address them one by one.
The first sentence is correct and the second sentence is a fragment.
Simile and imagery
Hughes is using simile in this poem to compare what happens when you put off dreams. He compares deferred dreams to things with very strong sensory imagery like drying up "like a raisin in the sun" or stinking "like rotten meat". These details help the reader understand the heavy impact of what will happen if you put your dreams on hold.
