Secondary Light Permanently mount a Petzl type lamp or put a mini-Mag on an elastic band. Gloves I like rubber coated for most purposes. Shoe Goo the toe areas. Good old volleyball type kneedpads are fine. Lighter Especially if your carbide striker doesn't work well.
Treated water is available at basecamp and other sources are prevalent throughtout the cave.
A 500 ml container usually lasts me for a 2-3 day trip. I always bring about 800 ml in though. Survey wear I bring a polypro top and bottom in case of the chills through damp survey. A hat or bandana is also nice. Food Everyone's different.