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It should be fine but like Laurarfl said they can absorb stuff from the water. If its just salt limit how many you offer and spread it out. Moderation is key. If there are other ingratiating I would avoid it.
Citric acid is Vit C. The other is a chemical that can be bought OTC to "sterilize" water or for people who make their own wine. It is just a common preservative that inhibits bacteria growth.