Change of Tourist visa to Work permit visa ?

Stores like Walmart and Soriana or Comercial Mexicana do have black tea.  Twinings and Bigelow are two brands I have seen.  You have to look close.  There was an organic foods place in the public market area in Zacatecas that had black tea.  You'll find it only in the bigger cities.

If you're in Mexico on a tourist visa, you are probably where you'd have to go back to your home country to start the paperwork.

Sorry but you can't change a Tourist Permit to anything.

To get a working Visa you need a job offer and then return to your home country to apply for a "working resident" Visa at a Consulate.

Very difficult ... it used to be easier

Many places in Mexico you'll find English speakers

thanks for the reply,
i have some informations already but the problem is we do not have Mexican embassy or consulate in our country, we either need to go nearest middle east countries to apply tourist visa or if we carry Britain or usa visa then we can come Mexico without a Mexican visa, i am holding 10 years UK tourist visa so i entered without a visa, immigration officer in Mexico handed over me a thin paper card on which he mentioned 180 days and U.K.
I can not go United States due to my immigration petition is pending, my wife and children living in Houston, i want live here because this is the nearest place where my family can visit me,

please help and guide me if you can as my life is miserable and inhuman, living apart from my immediate family since May, 2008.

Regards

Really, only Immigration (INM) can advise you.  There are offices in Mexico City, all state capitals and other large cities.  Hopefully, you have a friend who speaks Spanish.