Yes, you can have other soups, as long as they're well strained. But there is more nutrition in an optifast soup or shake, or something like Sustagen hospital formula. You should try to include something like that too if you can, plus drinking yoghurt, fruit juice and vege juice etc. You really won't be able to fit a lot in, but I was told not to worry about the colories/fat etc for the first two weeks, just to get in as much nutrition as I could (not much, LOL) to help my healing.
Good luck tomorrow - Carrie