Can we solve water shortages and avoid expensive infrastructure by using ships to haul "trains" of water bags from the Pacific Northwest to parched SoCal? Check out Spragg Bags.
Pro: Short-term solution (e.g., Delta levees break and SoCal water disrupted) that is probably better than tanker shipments and desalination.
Con: Encourages living in dry areas instead of wet areas. Not economic if price increases reduce demand below cost of bagg shipping.
Bottom Line: Technology may not solve an economic problem.