Most has already been said; take plenty of water and I don't mean just a couple of bottles. Take more than you need; you may need it.
I would buy some high tech cooling gear, cooling vest or whatever your pocketbook can endure.
A small packable nylon sun shade might be good. It's hard to find shade once you hit West Texas. If you did have a breakdown in DV, you would need some shade.
Of course, GPS , compass, etc. you could go on and on, might need a trailer soon.
I've had none of these things on trips except water in the big gallon jugs and did just fine. I kept a gallon sitting in my tank bag and one tied on behind.
Go and have fun.
1978 R100rs MOA#22600 125cc Kymco
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
I went thru' Death Valley yesterday. Highest was 114 degrees. No big deal really. The big item was the wind.
Coming thru' Panamint Valley the wind came very close to blowing me over sideways. I was down to real low angle to hold it down and it almost flopped me out. Maybe that's it. I was too low, but it was severe. And sand storm also.
Nice today coming over from Beatty to Ely.
Death Valley is a super ride, fall, winter and spring. What's that saying about mad dogs englishmen and noon day sun. DV is not fun in summer 115-120 degrees are common temps, asphalt has to be 30 degrees hotter