Now I know why cherry juice is so hard to find . I opened the bottle I got from Trader Joe 's , took a swig , and just about spit it back out . It was extremely sour .

Generate a question about the above context.
Why did the writer almost spit the juice out ?
Options are: --Because cherry juice is hard to find .. --None of the above choices .. --Because the writer took a swig .. --Because they did n't like the flavor of it ..