Congrats! I know I was excited - if I can say that, for the second surgery.
I’d suggest investing in a portable bidet or the kind that you can attach to any toilet. That had been a lifesaver. I suggest wipes, disposable underwear for the first weeks- the night tends to give way to leaks. I also bought a pad- the kind that goes underneath y when you are at the hospital, so I felt more comfortable and was able to clean up without having to change the sheets (if I did have an accident).
Id suggest some cream or ointment for your bum- they gave me some Coloplast Incontinence Ointment which is far better than others I’ve tried.
For food, I say keep it bland at first- cereal, bananas, chicken, etc. Hang tight on fiber at first but try stuff out and see what works for you. Do you know if they’ll put you on Imodium or anything when you leave the hospital? Stitches or staples? Or, I hear some docs don’t seal it up, they pack it and let it heal from the inside out.