So basically as long as you're starting out a healthy well-nourished person you can just get on with it.
I don't think that's great takeaway advice or an accurate summary. It may not intentionally be so, but it comes off as dangerous and reckless. The NIH article suggests that anyone who fasts for 10+ days is considered an at-risk group. OP asked about fasting for 14 days.
Any tips/sources?
Not scientific, but this is tried and simple tip from traditional Ramadhan fast-breaking in Tunisia.
We start with some dry fruits (usually dates) and olive oil (or butter), then some soup. I think the chewing first gets your body ready and the soup is there to ease the stomach into whatever your regular diet is.
Thank you.
Are there specific soups typically used? Or just any soup will do?
Start small with easy to digest foods, and reintroduce food slowly.
> Any patient with negligible food intake for more than five days is at risk of developing refeeding problems.