Yes. Alguma coisa = something/anything.
Let us see:
- I want to drink something (quero beber alguma coisa) - affirmative sentence.
- Do you want to drink anything/something? (Você quer beber alguma coisa?) - INTERROGATIVE sentence.
- I want to drink anything (quero beber qualquer coisa) - AFFIRMATIVE sentence.
- I don't want anything (não quero nada) - NEGATIVE sentence.
Anything has many translations in Portuguese, ir depends if the sentence is affirmative, negative or interrogative. So, anything also means "alguma coisa", but not in this sentence.
Thank you, that is very helpful. In English I learned "anything" is also used when you expect a negative answer. "Something " is used, when you expect a positive answer. Example: Do you want to drink anything (expected answer: no) or do you want to drink "something" (expected answer: yes) Is that in Portuguese likewise? Thank you