I would call your surgeons office for more clarification. Part of my 2 week preop diet is no caffeine, so real coffee is a no-no. The no caffeine rule also extends for me 4 weeks postop. It's gonna be a really difficult 6 weeks... My allowed clear liquids are water, crystal light, G2/vitamin water, broth, sugar free gelatin, sugar free popsicles, and decaf coffee or tea. Clear liquids 24 hours before surgery for my surgeons requirements.