64 oz is plenty for most people. People who complain about cramps need to ease up on fluids, not drink more. Drinking too much puts a strain on your kidneys. It flushes out electrolytes and other nutrients. If your intent is to flush fat, that will happen with a normal 64 oz day. We know that if you wait until you feel thirsty, you are already dehydrated, we which is why, these days, people tend to keep water more available. Most of us, who have spanned a summer- winter Keto journey know that thirst is higher in the warm months, than now, so it's harder to drink enough now. Do the best you can, but aim for 64.