https://www.businessinsider.com/engineering-firm-tow-icebergs-antarctica-for-water https://www.businessinsider.com/engineering-firm-tow-iceberg... So they are

https://www.businessinsider.com/engineering-firm-tow-icebergs-antarctica-for-water https://www.businessinsider.com/engineering-firm-tow-iceberg... So they are saying one iceberg could provide 100 million and 200 million m3 of water. According to wikipedia that's the global oil tanker transport load for a year and the largest tanker can load up 550k m3. It's also interesting what effect moving 200m m3 of ice to a desert climate would have on local climate. Even if their plan is unrealistic it sort of puts things in perspective in terms of quantities of water available.