Water birth

Stacie • 21 and have a beautiful boy named Freddie born 13/09/2016
I have decided to have a waterbirth and wondered if anyone who has had this type of birth knows if I should pack anything extra in my hospital bag.
I got the basics but don't know if I should take a bikini top or just a t shirt and whether I should take a towel or if the hospital will supply me one. 
Thanks for your help in advance