I live in Florida, so one thing I have in abundance is salt and brackish water on all sides. Of course, if I drink said water, it will suck. A lot. (Public service announcement: You can’t freaking drink salt water sillies). That being said, there must be some clever way to turn salt water into drinking water, right?
There is. It’s called a solar still, and in a pinch a still of appropriate size can create enough drinking water to keep you alive. This should not be your primary drinking water plan, but it will help. Here’s a picture of a solar still design: