Chris,
A drought is not a problem, in reality. It is, instead, a geographic time related fact, and they have occurred through time, including prior to humans being an industrial society. A single Krakatoa volcanic event spews 10 million times the amount of carbon, and chemicals into the atmosphere, all at once, instead of across the more accurate 140 years of human industrialization. 140 years is but a blink of the eye in geo time, Chris, not worth mentioning in comparison to, say, the 100 million years dinosaurs roamed the earth.
The notion, of you thinking a drought is a problem and what you can do about it, is hilarious to me, Chris. Honest.
99.9% of all life that lived on earth at any time is extinct, Chris, and while you might find that to be problematic, the same percentage, 99.9%, was extinct before humans showed up and figured out how to use fire.
You are a lot like the people that insist everything be compostable and biodegradable. That empty cartridge you cant find in the snow after you missed the last bird may not seem biodegradable, but, give it 500 million years or so, and I promise you, you wont be able to find a trace of it.
For a few different reasons.
I hope you can discover a few problems that a man can solve in the time allotted for doing that, perhaps sixty or so years, for most of us. A healthy garden, or a well reared child come to mind for me.
Not a drought. They will take care of themselves, and some life will adapt, and some other life, wont. Been going on a long time, simple as that.

Best,
Ted