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Do you mean four ounces of liquid at one time? Sure, that's fine. You can drink as much as you want as fast as you want, as long as it's not causing you discomfort. You need at least 64 ounces total per day.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.