I can accept that you might not know exactly where to put your question but I think that 'Food & Drink' might be the most inappropriate of all of the categories ;-)
Tetrachloromethane (or carbon tetrachloride as some people still call it) is highly toxic. It can cause damage to the central nervous system, liver and kidneys. It's also carcinogenic (cancer-causing) and ozone-depleting. 'Food & drink' it most definitely is not!
Tetrachloromethane used to be used as a dry-cleaning agent and was sold in shops under the brand name 'Dabitoff'. With increasing awareness of its dangers, the USA has made possession of tetrachloromethane (without a licence) a criminal offence. In the EU there are a limited number of suppliers who can provide the product to university laboratories and other bodies who may have a legitimate use for the compound (and who can also meet the requirements of the Health & Safety Executive) but otherwise, it's (rightly) impossible to get hold of.
Chris