Assalamu 'alaikum wa rahmatullah,
I kept intention tonight to fast the next day for a qadha from Ramadhan. So I woke up after Fajr had come in, I wasn't sure if I could break the fast or not, but I did wudhu as normal- I didn't take special care for what if water go down my throat or such. I am not 100% sure that water did go down my throat. As I said then I wasn't sure whether I was fasting or not but I read up on the fiqh after Salah and it seems that I have to keep up with the fast and if I break it then it will necessitate kaffarah as well.
While I was doing wudhu I was not sure whether I was fasting or not and henced acted like I wasn't. I haven't eaten anything as such just I remember that I am sure that I didn't intentionally drink the water during wudhu, although it might have gone through.
In the light of the above, would I have to keep this qadha again and also kaffarah? I am still fasting.