-WATER... A GALLON A DAY
AM I FORGETTING ANYTHING?
Bicycle -- best if you can bring a cheap but reliable bicycle yourself. But if you cannot, there is always Elliot's Bicycle Service, which will have around 15 bicycles to lend, and only a few are spoken for so far. I try to reserve them for people from very far away, but if you will be traveling to BM by motor-scooter, then we can probably fix you up with a loaner bicycle. And of course, ePlayans go to the front of the line.
Water -- probably more water, so you have some for washing also. Washing your whole self with a wash rag is considered an acceptable "shower". Buy the 1 Gallon bottles of clear plastic, not the 2 1/2 Gallon "suitcases" of flimsy grey "milk jug" plastic. The suitcases often leak.
Further about drinking water -- you will also want some Gatorade or other electrolyte supplement.
Food -- definitely bring some real food in addition to granola bars and such. You will most likely not eat much in the heat, but you do need proper nutrition in that harsh environment, and also to maintain a little bit of normalcy -- at least your first year.
Actual shower.... You can buy a black-plastic-bag-shower at a sporting goods store. It needs to be hung up high enough to shower under, of course. At the other end of the spectrum there are camps with elaborate showers. Not sure what to tell you except that it will be fine. If you borrow a shower, you should bring replacement water.
TP, single ply.
Lighting, and a flashlight. A miner's lamp -- straps onto your forehead -- is very useful.
Yes, there is much more to learn, and you will over the next few months.