I usually bring:
- LED flashlight,
- red LED flashlight (better for being able to see in the dark, also not as noticeable from far away)
- P100 mask / N95 mask
- disposable gloves
- small first aid kit
- usually some sanitizing/alcohol wipes
And a few other things I take
Sometimes I have goggles because I know it's gonna be dusty as hell and I just don't want to deal with that sort of shit
But yeah, being safe -- esp with not wanting to breathe in mold, asbestos, etc is good
And touching some things could have mold or whatever on them. I like looking through papers, or peeking in things to see what history there is, or hell... even just holding onto / leaning on things for safety while navigating
Avoid taking anything that would make you look like a scrapper, like tools or whatever