For one reason or another, a police officer has just asked you a question, and you've wisely decided not to provide any response that could be used against you in court. What can you say or do that will not be used against you?
It's often thought that "you have the right to remain silent," and so if you simply refuse to answer the question, then your refusal to answer can't be brought as evidence against you. But as mentioned in this answer discussing Salinas v. Texas, there are some circumstances under which a refusal to answer a question from the police can be used as evidence against you.
If you simply say "I want a lawyer," is that a response that can't be used against you? How about "I'm invoking my right to silence"? Or do you need to say something longer and more explicit, like "I invoke my rights under the Fifth and Sixth Amendments"?
My question is similar to this other question, but not exactly the same. That question is asking what response people can make to "avoid talking to the police and mistakenly incriminating themselves"; I'm specifically asking what response you could make that could not be used as evidence against you in court. I don't think the posted answers on that question clearly answer my question (especially since the top-rated answer seems to be contradicted by the Salinas v. Texas decision).
This question is primarily about the United States, but as always, answers related to other jurisdictions are welcome.