Bike touring/camping tip(s) I have a tentative first-time bike touring/camping trip in the planning stages and working out my set-up. I have a good idea of the essentials. My question is especially directed to those who have bike touring/camping experience. 

Beyond the obvious, what item did you really appreciate having along? Or, what item do you really wish you had, but didn't? 

A few important factors are: One, the trip is in an arid region. Two, a good 130 miles or so is quite remote. Three, it's a winter trip, but with (usually) much warmer temps than my native clime.

The item could be a spare part, an accessory, a tool, safety related, or a comfort item. Basically looking for things that a first timer wouldn't necessarily think of.
I've done 10 long-distance bike tours in the past and one of the things I've needed on almost all of my tours (but most people forget to pack) is an extra set of rack screws. These are the tiny little screws that hold your bicycle's racks, fenders and water bottle cages in place. As you travel, these little guys tend to wiggle themselves loose and fall out when you aren't watching. If you aren't carrying at least one or two extras, you might find yourself in bit of trouble, as having a loose rack dangling off of the front or rear of your bicycle can cause a serious accident while out there on the road. So pack a couple extra screws! They're lightweight and you can usually get them for free from your local bike shop.