Most vegetables like regular water, perhaps you could try asparagus which seems quite deep rooted (well it's awfully hard to dig up) although you have to wait a couple of seasons before you can harvest it.
Some herbs are pretty drought tolerant- rosemary for example although again that is more of a perennial.
Potatoes you can mulch very very deeply so perhaps would survive.
It depends how dry and hot it actually is?
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What vegetables grow best in dry conditions?
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