The Fifth Amendment of the US Constitution protects you from self-incrimination, you have the right to refrain from answering any and all questions that the police officer asks you. This means that you do not have to tell the officer how many drinks you had, where you were, or even where you are going. If you're nervous, this can make you slur your words, and the officer will then testify regarding. You do not have to answer the interrogating questions. YOU have the right to remain completely silent or cite your right to refrain from speaking. You do not need to say anything.
IF YOU have been pulled over by a police officer. You are required to provide your license and registration. You do not have to answer any other questions.