The purpose of this article is not to alarm but to give alternatives to using rinse aid. The FDA tests household chemicals and food-related products and these test show rinse aid is safe to use.
All manufacturers of dishwashers claim that for proper drying rinse aid must be used. A rinse aid’s only purpose is to aid in drying and reducing waterspots. It does this by changing the surface tension of water.
When a drop of water is put on a smooth surface it beads up. Surface tension is what holds that bead and it's the natural state of water. Just a drop of rinse aid changes the surface tension of a lot of water and makes it flow off objects easier.
Rinse aid is dispensed in the dishwasher's rinse cycle and coats the inside of your glass. When a glass from a dishwasher that uses rinse aid is filled with water, bubbles rise to the top and fall back down. Those bubbles aren't caused by detergent but by rinse aid.
Our bodies are made of 60 to 75% water. In my opinion, it's not a good idea for us and especially children to drink anything that changes the surface tension of water.
If you’re not satisfied with how your dishwasher dries without using rinse aid you can pop the door ajar (1") up to 30 minutes after the "dry" cycle. This is called "flash" drying and provides venting for moist air to escape from the tub. Do not leave the door open all the way as that is an accident waiting to happen. Also, wood or laminate countertops should have tin tape, poly or varnish applied along the bottom of the countertop just above the dishwasher so moisture doesn't absorb into the bottom to swell it. Even if not "flash drying", this should be done in units venting directly under the countertop .
A few more waterspots may be noticed if no rinse aid is used but one must weigh the practicality of ingesting a chemical against having spotless dishes.