The Tumbs/Rolaids was used to help maintain a satisfactory S/G. But you can accomplish the same thing by using Gatorade in place of water.

Nobody will know how much Tums you would have to take without knowing what the "baseline" level of your S/G would be before diluting - and you will not know this without testing your S/G with a validity test strip. These strips are inexpensive and are found online by doing a Google search for "drug adulteration test kits".

Having these kits at hand when utilizing dilution techniques is highly recommended, as these kits will also be used to check your creatinine level as well.