I am quickly learning that in Mexico City chili, lime and salt are quite possibly commodities just as valuable as petrol, groping and big, big numbers. Here is a bag of chopped apple I bought in the street- sharp and freshly coated. Actually the way the chili/lime/salt powder just soaks up the apple juice is a wonder. I might steal the combination. It is not as hot as you expect- a significant proportion of the powder (which is pretty ubiquitous for this type of snack) isn't just straight chili- don't be put off if you're scared by the heat.
Also in pic- bar snacks (with chili and lime and salt), tequila con Squirt (or Esquirt) which is a grapefruit pop. The best one as it is the least sickly sweet, and the only one most bars will condescend to allow you to mix with their precious tequila.