I use 22 cal per ounce when subsituting breastmilk for food.
Fluid requirements is based on weight. You said you were part of the blenderized yahoo group, go to the files section and there's a guide there to help you figure it. Fluid requirements don't need be exact either.... my dd has a cardiac defect and so I keep her on the dry side because of that.
You'll find that the blenderized diet is much more VOLUME than just breastmilk when you hit the fluid and calorie requirements. You replace one ounce of milk, you need to make up the calories AND the fluid.
Do you bolus during the day and continuous at night?
She's at 35 mls an hour now and she can go as high as 40-42 or so without puking. So we'll be ok upping the volume a bit if we have to. Or only taking her off for 4 hours. Or both.
My plan was to mix her food with 3 oz of water (which should be plenty for now since we'll only be doing 22 cal of some higher cal food). A week later, we'll decrease by another oz of milk and increase her food and another oz of water, and so on.
Since she'll be getting so little food at first, I'm considering doing a few small boluses when she's off during the day. I don't know...we'll see how much volume it ends up being first.
Since she gets so few calories, should we supplement with vitamins?