I have some unpleasant news for you, literally everything you have ever eaten has some level of adulterants in it. It's allowed: https://www.fda.gov/food/ingredients-additives-gras-packagin...

I know what you mean, and this is bordering on willful misunderstanding, but I'll still do this:

The most commonly used solvent is water. Ethanol is also a major one: https://www.worldofmolecules.com/solvents/

Some additional bad news about water if you don't like solvents in your food.

I have no preference, because a negligible amount of solvent is, by definition, indistinguishable from none.

Amount of caffeine in regular coffee: ~100mg per cup.

Caffeine LD50: 150-200 mg/kg (according to Wikipedia).

Maximum allowed amount of methylene chloride in beverages, the dreadful paint thinner, according to the link above: 10 ppm, or about 2 mg per cup.

Methylene chloride LD50: 1.25 g/kg (again, according to Wikipedia).

I.e., you will literally die of caffeine poisoning long before the paint thinner gets you.

I'd wager that is impossible. There will always be some contamination. The important thing is that it's small enough to not cause any harm.

One does achieve "none", tis marketing hype and wasteful. For instance, if you eat or drink any fermented foods, you are regularly consuming organic solvents. Undistilled alcoholic beverages contain quite a few interesting organic solvents that contribute to flavor (and hangovers).