Think about cactuses when you hack 'em up for drinkable fluids - not all cactuses have water in them, and many of them are actually poisonous.
Also, when sleeping in the night (if you for some reason decide to do that), bury yourself in the sand. That'll protect you from the cold (read; hell-freezes-over-temperature) desert night. That's what bugs do, since the sand is still warm from the day.
But yeah, walking in the night is the smart thing to do.
Also, you can purify your own....err...liquid waste products....to water again...using a still of some sort.
Hm, what more, what more? Let me dig out my survival handbook and see.
There are dried up flood beds, so-called wadis, that some times hold small, hidden water holes, usually covered up by rocks or bushes.
Also, when digging for water, do it between two dunes, or in the outer edge of the turn of a wadi (flood bed). That's where you'll find water.
And of course, water is in roots and some times in cactuses, for you to eat.
If you find trees or somesuch, you can place a plastic bag over it's leaves, tying a rope to close it around said leaves/branch, during the days, thus causing the thingie to "perspirate" giving you a few droplets of water. Not much, but a little, maybe enough to keep you going.
And lastly, always weigh the possible water gain against the possible loss of said water when you perspirate working to get it. Always work in the night, not in the days.
Just my 2 cents.
