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Hydrochloric acid, sodium hydroxide: common food additives to balance its pH. Technically included by the OP, as they're made from water and salt.
Silica: another common food additive (anticaking agent). Arguably "not food" because your body will simply poop it, undigested.
Metallic iron: if you're cooking in a metallic pot, some of the metal leaks into the food. Actually good in this case as iron is an essential mineral.
Metallic lead [historical]: the Romans used lead pots quite a bit, specially to boil either vinegar or barely fermented wine (mustum). The result is extremely sweet due to lead acetate, the first artificial sweetener that I'm aware of ...and extremely toxic. (OK, it's a partially organic salt due to the acetate anion, but still.)
Calcium carbonate: already mentioned by another user. It's essential to nixtamalise maize, but it's also used for stuff like candied pumpkin cubes.