Just for experimentation's sake, I started trying Tim's method. I mixed the batch up on Sunday and had some yesterday and today (Monday and Tuesday). Early results very interesting. Normally, would need ~ 500 - 600 cals of oil, SW, or protein powder shake (imbibed so as to be essentially flavorless) to get me to dinner time (with no other food). Yesterday and today, needed only 300 cals of mush (taken per Tim's approach) to get me to 7:00pm, at which point I've had a dinner. This includes a 4 mile run both days. Will keep you posted over the next week or so.
Also, re: your question jzkc, here's how I've tracked. I created a mush with boiled, then liquified vegetables, protein powder, garbonzo bean powder, etc and when I made the mixture, I kept track of total calories in the whole batch (~800 cals). I then divided into 4 equal parts (200 cals per portion) and put into small plastic containers. Can easily and pretty accurately approximate based on how much of each container I've eaten. So there you have it. . .