It isn’t like dreams of antigravity or anything like that. Distillation requires a heat source, condensation requires cooling. RO requires pressure. I am not saying it is an easy problem to solve, but we did manage to send a man to hit a golf ball on the moon, and develop computers that fit in a single room. My Grandmother saw all those things accomplished, but as a child, rode to school every day on a horse. It is hard to predict what we or our children will live to see.