advice on stephanotis

I think this is also called the madagascar jasmine. I have recently purchased this, but it is showing signs of wilting already. It was in flower when I got it, but these have just fallen away one by one, and the leaves are looking as if they may follow.
I didn't give it a lot of water and it was on a fairly bright windowsill, should I try feeding? i don't want to make matters even worse Help!!
And is it possible to take cuttings from them?
Thank you