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Okay so if I have a village out in a desert, and they have access to enough water to drink and some extra(water comes from a magic device that turns magic into water so there isn't a nearby body of water. Also can't use magic to make food). What could they do to feed themselves?

Raise animals and get animal food from trade?

Is there a way to use water to turn some sand into farmable soil?

Is it impossible and the only way for them to have food would be to trade?

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    $\begingroup$ Read about Petra, which is in modern-day Jordan. Fascinating. $\endgroup$ – Hugh Meyers Apr 11 '16 at 16:03
  • $\begingroup$ ok you cant use magic to make food but can you use it to grow plants? make one plant produce a variety of fruits not belonging to the plant? make cultivation easier? help growing livestock? etc. That aside, you might want to look for Desert Farming $\endgroup$ – Erik vanDoren Apr 11 '16 at 16:37
  • $\begingroup$ Not all - really not even most - deserts are sand. Consider e.g. California's Imperial Valley, naturally a desert, but with large areas of farmland irrigated by the Colorado River. $\endgroup$ – jamesqf Apr 11 '16 at 17:46
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The solution could be the use of Hydroponics farming.

It's possible to use the sand as substrates and human faeces as fertilizer.

At last, there are edible plant that can grow in arid area like Opuntia ficus-indica

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