One more essential is good balance, which your body can aquire from lots of practice. When going off a huge drop, dont just ride straight off. You have two options, you can either come really fats p to it and do a tiny pop of of the edge. On the landing on either of these techniches on the land ing you have to absorb the landing and bend your knees and arms. When it becomes green, don't clean your camelback with toxic cleaning products or you'll have the impression of drinking directly out of the toilets.
All drugstores sell small tablets used to sterilize the baby's drinking bottles.
I have found that handlebar tape works well on your bottom chainstay to prevent gauges from chain slap or other mishaps that might damage your frame. Make sure the stay is clean and thoroughly dry and just wrap the tape around it, making sure that it has a tight seal with the frame to prevent moisture from entering. I carry an old sock for use when my chain comes off. You carry the sock inside-out. Slip it over your hand, put your chain back on and slip the sock back off.