More to save on the electric bill than on California's water, I habitually have showered only twice a week for years. I can get away with that partly because I work at home. You can't smell me over the Internet.
I was brought up to bath or shower once a day, and I do enjoy a hot shower. I enjoy it especially when I think about how the Apocalypse could come any day. No, I am not expecting the return of Jesus. He said he would return during the lifetimes of his Apostles, and he didn't.
By Apocalypse I mean all the ways the civilized world as we know it could fall apart.
I am a child of the Atomic Era, so my earliest apocalyptic worries were about Atomic War. Apparently that came pretty close to happening several times both before I was born (in 1955) and on up until the end of the Cold War. It still could happen. Even a single atomic bomb going off in New York City, Washington, London, or perhaps Moscow could bring on a kind of lesser economic apocalypse that could turn hot showers into luxuries.
I live about a half mile from the San Andreas fault, so a major earthquake is a real possibility. That could bring on a local apocalypse, but would not effect people outside of California much.
Some people think storms will get worse due to global warming. But I see storms as just temporary apocalypse lite events. If it takes a long time to repair the electricity lines I would long for a hot shower.
Famine might leave us with hot showers, but hungry. It is hard for Americans to grasp how bad a famine could be. Most post Civil War hunger in America has been due to screwed up economic priorities, not due to an actual shortage of food. But look at the recent egg shortage. What would happen if the corn and wheat crops failed in a major way two years in a row? We don't have a lot of food in storage in the U.S. any more, not like we had during the Cold War. People would fight over food, with the relatively rich probably getting most of it.
I live in the country, but not in a food-producing region. My soil is lousy, it required fertilizer to produce anything edible. The only thing I typically have a surplus of is apples. Apple trees love it here. I know how hard it is go grow enough food on a small scale to do more than just supplement food that comes from professional large-scale agriculture. Don't kid yourself. A suburban backyard garden won't keep you from starving to death (if you can't get food from outside), it will just slow down the process. Assuming your water supply is even working.
But the most likely and scary form of apocalypse would be economic and social collapse. I don't see that coming until we have another bubble of some sort first. Even then if people have done some saving in the meantime and keep their heads, we might muddle through. My main concern as an analyst is the National Debt. It has become a balloon, and if interest rates rise enough, it will balloon so fast it could take down the government and economy.
Sometimes people just go nuts. Enough nutty people and the economy tanks, the government falls, and the next thing you know food does not get distributed, and neither does electricity, and so: the end of hot showers.
Or it could be a combination of things. Like when people walk out on a balcony with wood rot. Dry rotted wood can be surprisingly strong, but put enough weight on it, and at some point it reaches the snapping point.
A sudden jump in the rate of global warming, a tightening of world food supplies. A war in the Middle East spilling over into India or Europe. Too much debt. Too much political gridlock. Too many people unwilling to give up their oversized piece of the pie for the common good. A blight striking down grain crops, or perhaps knocking down a good proportion of the human population. Plans based on growth suddenly up in smoke, defaults on loans, low tax receipts, a default on the federal debt, Dr. Strangelove firing off a nuclear missile thinking that, somehow, will make things better.
Of course the Apocalypse might kill you, or me, but I enjoy thinking about surviving it.
Enjoy your next hot shower. It is not likely to be your last, but it could be.