I am the owner of a kosher restaurant in Cancun. But beside us, there are many options for kashrus here. I am from Mexico city. When I got here I was pleasantly surprise at all the kosher options there are. The Chabad house delivers food at the hotel zone, there is a kosher store, and being mexican I know we can get many kosher products at the local supermarkets. Dont bring your own food, There is cholov and pas yisroel as well as all sorts of kosher products here, From raw chicken or meat to sweets and chesse, milk, cereals.. DOT5 RISK IT.