The main problem is the lack ...

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The main problem is the lack of industrial installations for the production of drinking water from the air. There are many homemade devices. They can be found on the Internet. To date, the best option is to built  wells to get water from the air.They were built in  the Middle Ages on the Great Silk Road.
With environmentally friendly processing of food waste and human life waste  into hygienic clean compost, organic fertilizer and other products, there are no problems today.