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I had a PET/CT yesterday, and my mom has had numerous PET/CTs, and I don't think she's ever had to drink that much water before hand. I didn't yesterday, but neither of us have had it with contrast, just the radioactive isotope or whatever it is they inject. Maybe the water is for flushing out the contrast after the scan? We haven't had the high-protein meal instructions--just ate whatever the night before.
Something important that they sometimes forget to mention is no exercise the day of the scan or the day before the scan. This restriction includes gardening and house cleaning. If you use your muscles too much the day before, the muscles will take up the glucose instead of the tissue that is being scanned, and it can affect the PET results.
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