My table salt has sodium hexacyanoferrate II as anti-caking agent. Still it's rather surprising if all those including Fox Talbot who used salt had cyano-derivatives in it.
I did check,for example, ebay India, film can be purchased shipped from the US but not fixer, it may be related to shipping cost.
I don't think Caffenol-table salt-mobile phone as a route into film photography would appeal to many on APUG but it is very low cost if you have the phone so just mention this route exists, a search reveals some recently tried caffenol-table salt.