There was an idea some years ago to drag icebergs here from the arctic, but I don’t think it went through.
If you recall the annoying Dassault Systemes ad that was on TV last year or so, they showed that they had done the math on towing icebergs.
I looked up the paper on that. Turns out that you can drag icebergs, but they melt really quickly when you get them into warmer water (who knew?). If you double the horsepower (2 tugs), you can move it a tiny bit faster. It also melts faster. If you can encase the whole thing in an insulator, you might be able to get some water to your equatorial desert destination.
But the enviro's might object to your use of a square mile of Styrofoam.