https://www.wikihow.com/Make-Distilled-Water

The first two setups are great if you have a stove or fire. Ice is not necessary, but will speed it up.

Personally, I would run rain-water through one of the first two setups, but it should be drinkable as is.

https://www.distilledwaterassociation.org/2018/08/08/how-to-make-distilled-water-easy-with-the-power-of-the-sun/

This can work too if you have no heat source, but will be much slower. It is essentially the 1st setup from WikiHow, but with tarps and the sun.