We have a chain of solar vacuum pumps. The first raises sea or river water up by 1 m, and the rest pump the water to an inshore reservoir or lake.
The water boils into pure water vapour – no salt or contaminants. The water is desalinated and pure. We will need salt licks, to give the animals salt.
The 1st world gives the pumps for free, from aid. So ending global hunger and thirst.