Danglerb wrote:

reverse osmosis filtering
would remove any residual salt or anything else.

RO definitely does not remove everything. Distillation comes far closer
to that goal and is simpler. Distillers last practically forever. They
are easy to keep clean if you feed them soft water.

You can try out distillation by spending $100 on a Megahome or Kenmore
countertop unit. If you don't like it, sell it on ebay for $70.