I’m not one for allowing tech triumphalism to tout its solutions as silver bullets, for example if the environment is polluted enough then even potable water from it won’t save us, but I do think this technique has a lot of promise because of its eschewing filters, its low energy inputs, and its relatively simple componentry (e.g. no motor):

MIT Engineers Created a Portable Device that Zaps Seawater to Make Drinking Water | The Daily Beast
https://www.thedailybeast.com/mit-engineers-created-a-portable-device-that-zaps-seawater-to-make-drinking-water