What should I bring for a sauna session?
Short answer
Nothing you do not already have on. Bring or use a towel to sit on, wear something you are comfortable being warm in, and drink some water beforehand.
What is provided
Towels are provided, as they are for a float.
What to wear
Light clothing or a swimsuit both work. The room is private, so it is your call.
Water
Have some before you go in and more afterwards.