Average high daily temperature at Furnace Creek in July is 116f. See this page for annual temperature date:
https://www.nps.gov/deva/planyourvisit/weather.htm
I have ridden in Death Valley a few times but never in July. As @
skidder points out above, Death Valley will not be the only hot area with limited services that you will traverse. Everything from Las Vegas to the Owen's Valley is pretty sparsely settled. I wouldn't worry a lot about drunk drivers. The roads are lightly travelled through the park in July and the bars are few and far between.
Brent