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First of all, a 5 star hotel will have filtered water and ice so you can drink safely. The walmart is downtown about a 10 min. walk from Mercado 28. Bus R15 will take you there.

Safe places to eat are the bigger places that are commercialized like Senor Frogs or Bubba Gumps, Outback, etc.

Stay away from street vendors and small dives. My daughter and I just returned from Cancun a few weeks ago. Shopping places are everywhere and mainly there are artesians stores where they all make their own things to sell. The things are the same at all the places and everyone tries to sell tours. El Sombrero restaurant is good, it's near coral *****.

I have been through some training regarding safety when traveling for business overseas and believe it or not, Mexico City is one of the top cities that are considered unsafe for an American to travel to. Sorry - I know that is pretty harsh, but very true. I was surprised, it out-ranked the middle-east. There are 2 things you want to watch out for - use only a reputable well-known cab company. Some cab drivers will take you out of the way where you will be "robbed" at a stop light when some thugs jump in and rob you as soon as the cab stops. The driver will act as though he is fighting for you, but he is actually part of it. The #1 thing to be careful of is standing outside of your hotel and being picked up to be robbed. What they do is steal your ATM/Debit card and credit cards and keep you with them for several days until they empty out all of the accounts. They will beat you up during the process and dump you off when they have all your money. The best rule of thumb is to have a plan/itinerary and stick to it. Don't wander off on your own and don't linger anywhere you shouldn't be.