Caffine Or Sugar?

[meford 15]

I am on day 3 of pre-op diet of 2 shakes and a reasonable healthy meal. I have cut out sugar but have still has 8oz of coffee or tea for the caffeine. I wanted to ease slowly away from caffeine. I this a huge deal. I plan on stopping on all caffeine at the latest two weeks prior. In my mind getting rid of sugar is the most important. Surgery is dec4. What about skim milk for the shakes? Is that a no too bec of the sugar. Just bought unsweetened almond milk to try. Everything just has a sugar free taste!!